Category: science kits

Wednesday, 6 March 2013

09:17 – Barbara picked up her mom from the hospital yesterday and brought her home. Sankie was apparently talking nonsense for most of the trip home and for a while after they got back to the apartment, but Barbara said her mom started to settle down after Barbara gave her the no-more-of-this-or-else speech. Our phone didn’t ring after Barbara got home, so we’re hoping that Sankie will settle down and start behaving. Sankie must know that if she starts up again, Barbara and Frances will have no option but to move her to a different facility.

One of the “new” chemicals we plan to include in the life science kits is universal indicator, which provides a visual indication of the approximate pH of solutions. In very acid solutions, pH 2 or lower, the indicator is red. As the pH increases, the color changes through rose (pH 3), orange (4), orange-yellow (5), yellow (6), lime green (7), green-blue (8), cyan (9), lilac (10), violet (11), and finally to pure blue in extremely alkaline solutions. So I just made up and tested two liters of the stuff, which is enough for 60+ life science kits.


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Tuesday, 5 March 2013

07:40 – Barbara is leaving work at 1:00 p.m. today to drive to Thomasville to bring her mom home from the hospital. Everyone is keeping their fingers crossed, because this really is Sankie’s last chance. If she starts acting paranoid and delusional again, Barbara and Frances will have no choice but to move Sankie permanently to a facility that’s equipped to deal with such problems.

Barbara is adamant that it’s sink or swim time. She won’t stay over at her parents’ place tonight. Her mom has to settle in and behave normally. There’s no other option, unless her mother wants to be separated from Dutch and live in a different facility.


08:44 – It’s interesting how my attitude about inventory levels has changed. I just checked status on the items that I need to build more chemistry and biology kits. Among the items included in both kits are polypropylene beakers. The biology kits include one each of the 50, 100, and 250 mL PP beakers. The chemistry kits include two each of the 50 and 100 mL PP beakers. I currently have 79 of the 50’s, 59 of the 100’s, and 73 of the 250’s in stock. Not all that long ago, those would have been reasonably comfortable numbers. I’d have been thinking about reordering, but not urgently. Now, it’s panic reorder time. Less than 30 chemistry kits’ worth in stock. So I just did a purchase order for 600 each of the 50 and 100 mL beakers and 180 of the 250’s. Not to mention 400 Petri dishes.


10:40 – How could I have forgotten to mention this? In the past, the Academy of Canadian Cinema & Television has had two separate award tracks, the Canadian equivalent of the Oscars for cinema and the Emmys for television. This year, for the first time, they consolidated the two and created the new Canada’s Screen Star award. And the first-ever winner of the Canada’s Screen Star award is, you guessed it, Amber Marshall, the star of Heartland.

By the time I’d watched the first five minutes of the first episode, I knew that Amber was something very special. She is a stunningly good actress, effortlessly assuming the complex personality of her character, Amy Fleming, a mixture of vulnerability, determination, courage, insecurity, and above all a love for animals. Or perhaps she’s not acting. She’s said that her role on Heartland is her dream job, combining her love of acting and her love of animals. Amber may just be playing herself. In either case, she’s well worth watching.


11:40 – Geez. Barbara called about 11:00 from her cell phone to say she’d left work earlier than expected because her dad was bleeding badly from his leg. She called back a few minutes ago to say she was over there and it was no big deal. Her dad had been attempting to change the bandage on his leg wound, and called her to say it was bleeding badly. As it turns out, he scratched his leg in a different place and it started bleeding. All it needed was a band-aid. As Barbara said, her parents may survive all this, but she doesn’t think she will. She’s going to have lunch with her dad, head over to pick up her mom from the hospital, bring them home and get them settled, and then come home. She can’t take much more of this. She’s already taken more than anyone should have to. I’m going to suggest to Barbara that from this point forward if her parents have any kind of medical emergency, they call 911, period. The hospital can contact Barbara and Frances, if necessary. Barbara and Frances simply can’t continue to be on-call 24 hours and go rushing over there every time something happens. It’d be one thing if Dutch and Sankie could be trusted to call them only for real emergencies, but obviously neither of them can be trusted to know what is and isn’t worth calling Barbara and Frances out for.


13:57 – I’m apparently sucking some of my wholesalers dry on some items. I tried to order 600 each of the 50 mL and 100 mL PP beakers this morning and found that they were backordered. The good news is that they have another shipment coming in on 29 March. The bad news is that that shipment is only for 3,600 each, so I’m claiming a sixth of what they’ll have available until late April. Same deal on the Petri dishes. I intended to order 400 of them, but the vendor had only 360 in stock and no outstanding order with their supplier for more. So for at least a couple of months, they’re going to be out of stock on those Petri dishes. Same deal on the prepared slides I ordered for the SK01 slide sets. I took all they had, leaving them with just a few leftover miscellaneous ones. And UPS showed up a few minutes ago with an order from one of our chemical suppliers. I got most of what I ordered from them, with the exception of 3.5 liters of glacial acetic acid and half a kilo of lead acetate.

We’ve had minor issues with backordered items in the past, but with only one or two exceptions we were able either to second-source the item or substitute for it. But as our volume ramps up, I can foresee that managing backorders is going to become more of an issue, particularly for items that I can’t second-source or substitute for. One good example is the stainless-steel micro-spatulas that are in all of our kits. Last month I ordered 400 of those and found that there were only 100 available. We can’t second-source them because no one else I can find carries that exact spatula, and we can’t substitute for them because the instructions for the science kits sometimes say to use x number of rounded spatula spoons or whatever. So, when the vendor told me that 300 spatulas were back-ordered until mid-April, I told them to boost that back-order from 300 to 700 units. That ties up some working capital, but that’s a better option than running dry in our busy season.

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Monday, 4 March 2013

09:21 – Barbara spent the night over at her dad’s place. She’s home tonight and then pulling a double over at her dad’s place Tuesday and Wednesday nights. Frances is doing Thursday and Friday nights.

Frances called yesterday because she was concerned about a redness around their dad’s injury. She decided to haul Dutch over to the private emergency care place to have it looked at. They said it was no big deal, but prescribed an antibiotic and saline irrigation. Frances picked up the antibiotic, but Barbara said she’d stop on her way over after dinner to pick up the 0.9% saline wash they’d suggested. I told Barbara I’d make it up right here in the sink and save her the trouble of stopping at the drugstore. I just dissolved 9 grams of table salt in a liter of tap water, and didn’t bother to autoclave it. After all, more airborne bacteria will settle on Dutch’s skin during the irrigation than are present in a whole liter of tap water.

Science kit sales have picked up over last month. In the first three days of March, we’ve sold five kits, and we’re averaging about 0.80 kits/day year-to-date. That’s pretty scary, given that in the first three months of 2012 we averaged about 0.12 kits/day. This is our slowest time of year. Factoring in seasonality, that puts us on track to sell 1,500 kits in 2013, assuming we can build and ship that many.


13:01 – I see that Latvia has formally applied to join the eurozone, which is kind of like formally applying to board the Titanic. After it’s already hit the iceberg.

I think it’s safe to say that no sane person, including sane politicians (if there is such a thing), would want to be a member of the eurozone. If you’re in one of the dozen or so worse-off countries, the euro is choking the life out of your economy and causing severe social unrest that may end in revolution. If you’re in Germany or (decreasingly) Austria, Finland, Holland, or Luxembourg, being in the euro means you’re on the hook for paying the multi-trillion euro bills of the worse off eurozone countries. What’s not to hate? Crappy taste. More filling. Geez.

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Sunday, 3 March 2013

09:11 – We’re getting near the end of all three series that we’re currently watching on Netflix streaming, so it’s time to start sampling a few of the 150+ other entries in our Netflix instant queue. One of the series that we’re about to finish is Rescue Me, Denis Leary’s program about FDNY firefighters. That series is excellent across the board: great writing and an excellent cast. There’s not a weak member in that cast, but Barbara and I agree that one of them stands out even among that superb group. Callie Thorne, who plays Sheila Keefe, is stunningly good. She can do more with a raised eyebrow than most accomplished actresses can do with a Shakespeare soliloquy. We’re looking forward to watching her in other series.

Speaking of excellent TV series, the Canadian series Heartland reaches a milestone this evening, when its 100th episode is broadcast. Heartland is only the second Canadian one-hour drama series ever to reach 100 episodes. It’s also, along with Rescue Me, one of very, very few series I’ve ever rated five stars on Netflix. Alas, Netflix has only the first two seasons and the first 14 of 18 episodes in series three.

Meanwhile, I’m currently running an experiment in the kitchen. The biology and life science kits include a packet of lima bean seeds. The other day, I was about to order 5 pounds (2.3 kilos) of lima bean seeds from one of my on-line vendors when I was struck by a cunning plan. Those vendors typically charge $25 plus shipping for 5 pounds of lima bean seeds. But I can get 5 pounds of dried baby lima beans at the supermarket for $8 or so. So when Barbara made a quick stop at the supermarket yesterday, she brought home a one-pound bag. I planted five of those seeds in a cup of vermiculite, which is now sitting in the dining room, where it gets lots of morning sun. I’ll keep an eye on them for the next week or ten days. If they germinate, and there’s no reason why they shouldn’t, we’ll just use lima beans from the supermarket in the kits. The cost savings would be pretty minor, maybe $0.10 per kit, but we do everything we can to keep the price of our kits as low as possible.


10:49 – The house just resounded to my Quack of Triumph. (Being a Linux guy, I quack rather than roaring.) A few months ago, I noticed that our washing machine was agitating intermittently. I ordered a replacement agitator subassembly with dogs a couple months ago. I think it cost $14 or something like that. As it turns out, I could just have ordered four dogs for about $3, but I’m just as happy to have the new agitator subassembly installed. As Barbara said, that should last the remaining life of the machine. It took me all of five minutes to do the repair, and four minutes of that was finding the correct socket and a long enough extension for my 3/8″ ratchet.

Which got me to thinking of just how valuable the Internet is, even in invisible ways. I started by searching Google for something like “agitation problem” “whirlpool washing machine” and got a bunch of hits. Among those were several on YouTube, one of which illustrated the entire process of replacing the agitator subassembly on my exact model of washing machine. Then I used Google to find the correct part number and find a good price for it, and order it. The next day, it showed up. Of course, it’s been sitting on the dryer for a couple of months waiting for me to get a round tuit, but the point is that I could have discovered the problem one day and had it fixed the next. That’s probably as fast or faster than making a service call, and certainly a whole lot cheaper. Before the Internet became what it’s become, I could still have made the repair, but it would have taken me at least a couple hours to find out what part I needed, check to see if it was in stock locally, drive over and buy the part, and make the repair. Thanks to the Internet, this kind of efficiency happens millions of times a day in one way or another.

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Saturday, 2 March 2013

10:04 – Barbara stayed with her dad last night, and will be back sometime this morning. Before she headed over there last night, I talked to her about ending the dad-sitting duties she and Frances have been doing every night since he hurt himself a week ago. Staying over there every other night is very wearing on Barbara, physically and emotionally, and must be the same for Frances. I told Barbara that I thought she and Frances needed to pace themselves, because no one knows when the next real crisis will occur.

We’re in pretty good shape on science kit inventory now. We have, either as completed kits or as subassemblies ready to build, about six dozen each of the chemistry and biology kits. We introduced the biology kits last April, and I just checked the sales ratio of biology:chemistry kits over that full period as well as the last six months and the last three months. It’s remarkably consistent, with biology kit unit sales holding at about 55% of chemistry kit unit sales. In other words, we sell about 1.8 chemistry kits for each biology kit. That means that if we want a total of 350 more biology and chemistry kits ready to ship as of 1 July we need 125 biology kits and 225 chemistry kits. That in turn means that over the next four months or so, we need to label and fill something like 15,000 containers, or roughly 125 per day. That’s doable, but we’ll be busy between now and the end of the year.


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Friday, 1 March 2013

07:39 – Barbara arrived home about 2200 last night, after a long day, visiting her mom in the hospital, and then having dinner with her dad and sister. She says her mom is doing better, although from her description it sounds as though Sankie is still acting paranoid and delusional. Barbara is hoping she’ll be well enough to come home next week. I hope that’s true, because it’ll allow her and Frances to stop alternating nights staying with their dad.

According to the morning paper, there’s a revolt brewing about the new property tax values that have recently been mailed to homeowners, but not in the usual sense. The county reassesses tax values every four years, and every time in living memory until this time, those values have gone up. This time, a lot them went down, some by high percentages. The paper mentioned two in particular, one woman whose new assessment on her home was for only 50% of the 2009 tax value, and a second whose new assessment was for only 30% of the 2009 tax value. Both of these homes are located in East Winston, which is the poorest area of Winston-Salem and predominantly black. And many other homes, in East Winston particularly, have also had dramatic reductions in their tax values. Some spokesmen for the black community are publicly accusing the county of conspiring to destroy the black community, saying that their equity is being “stolen” from them. The reality, of course, is that these new valuations probably overstate the actual value of the homes, if anything. Assessed tax values do not determine either the selling price of homes or the loan value for those seeking to refinance. Even if the county tax assessor had left those values at their 2009 levels, those homes wouldn’t sell for any more than they do now, nor would banks be willing to lend money using those homes as collateral. So, in essence, these people are actually demanding that they be charged higher property taxes. Geez.


11:07 – This is pretty cool. We just made the OEDb’s list of the 100 All-Time Greatest Popular Science Books. Our chemistry book is at #51 (although the books aren’t ranked) alongside titles like Cosmos, A Brief History of Time, The Origin of the Species, Gray’s Anatomy, The Elegant Universe, and many other really great science books. We preen.


15:31 – If I ever wondered why biological stains are called “stains” rather than “dyes”, I’ve just had it brought home to me in spades. I’ve been filling 60 sets of stains bottles for biology kits, and the last two I’ve filled–Hucker’s crystal violet and Sudan III–are the stainiest stains I work with. I’m used to them staining polypropylene beakers and glassware, sometimes indelibly for all practical purposes. No solvent I’ve tried will remove some stains from plasticware and even abrasive cleanser has difficulty removing some stains from glassware. But today I was using my bottle-top dispenser, the parts of which that are in contact with the liquids being dispensed are made of Teflon. Teflon, the very definition of “nothing sticks to it”. But these stains do. It’s really no big deal. The staining is cosmetic only, and by definition it’s not going to leech out to a different solution, at least in concentrations that are detectable even instrumentally.

But just wait until Barbara gets home. I’ve been doing cleanup in her kitchen sink. It’s “stainless steel”, but (you guessed it…) it’s now stained in pretty hues of violet, red, and orange. Fortunately, I know from experience that those stains can be removed, eventually, with a lot of abrasive cleanser and elbow grease. I’m not going to bother cleaning the sink today because I still have some work to do that would just stain it again. But I will clean the sink thoroughly tomorrow.

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Thursday, 28 February 2013

08:56 – Colin let me sleep in this morning. I awoke at 0755 and found Colin sprawled full-length on his back on Barbara’s side of the bed, still fast asleep.

One of the new science kits I’m seriously considering is a consolidated middle school science kit. There are three “standard” middle-school science courses: life science (introductory biology; usually grade 6 or 7), earth science (or earth & space science; usually grade 7 or 8), and physical science (introductory chemistry and physics; usually grade 8 or 9). Many homeschool parents try to cover all three of these courses in two years, grades 7 and 8, leaving grade 9 available for a first high school level science course. Traditionally that’s been first-year high school biology, with first-year high school chemistry in grade 10, but increasingly homeschoolers (and many public schools) are swapping those, teaching first-year chemistry in grade 9 and first-year biology in grade 10. That’s because modern biology courses are increasingly taught bottom-up–starting with the chemistry of life, life processes, cellular chemistry, and so on–rather than the old top-down approach of starting with organisms and working down toward cell-level issues.

We’re already planning to introduce separate kits for each of those three courses, starting with life science, but I realized that there are likely to be enough materials in common in those three kits that it might make sense to also offer a consolidated kit that would include the equipment and chemicals to do all three courses. It’d be a relatively expensive kit, but not as expensive as the three separate kits. If we do decide to offer a consolidated kit, it’d be a 2014 or even 2015 product, but it makes sense to think about it now because it would effect how we design the three separate kits.

And, on that note, I think I’ll make up a liter of universal indicator solution today, because that’s one of the chemicals that would probably be in the kit and I haven’t used it in probably 40 years. The stuff is ridiculously expensive to buy, but considerably less so to make.


11:49 – I thought this was interesting. Apparently, acetaminophen is even more toxic to snakes than it is to people. That’s pretty damned toxic, considering that something like 50,000 Americans a year are treated in emergency rooms for acetaminophen poisoning and about 500 of them die.


14:02 – I have finally had enough of being spammed by Shapeways. I was surprised that they spam, because they’re supposed to be a community effort in the MAKER tradition. But they’ve been spamming me for two or three years now. I have clicked on the unsubscribe link many, many times. I have sent them email. But the spams just keep on coming. So finally I went to their customer service page and left the following.

What do I have to do to get you to stop spamming me? I bought one item from you (a Dremelfuge centrifuge head) two or three years ago, and you have been spamming me ever since. I never “joined” your community, nor did I ever give you permission to email me.

So, please take me off your mailing list immediately. I should tell you that I’m an O’Reilly/MAKE author, and if you keep spamming me I’m going to do everything I can to make sure my readers are aware that I consider your company’s business practices unacceptable.

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Wednesday, 27 February 2013

07:37 – Unless we get a flurry of kit sales today and tomorrow, February 2013 will be our worst month in a long time. Not that that’s anything to worry about. For the last several months, kit sales have been four to seven times higher than month-on-month figures for a year earlier. For February 2013, our sales have been “only” three times those of February 2012. Unless March through May are catastrophically bad, we’ll remain on track to at least triple if not quadruple kit sales this year, assuming we can get them built.

We’re almost out of chemistry kits, so I took some time yesterday from working on the new batch of 60 biology kits to put together two dozen each of the regulated and non-regulated chemical bags for the CK01A chemistry kits. I’ll build a dozen chemistry kits for stock today.

Barbara is coming home after work to have dinner and then head over to her parents’ place to do dad-sitting duty tonight. Dutch is doing pretty well, but Barbara and Frances don’t want to leave him alone at night until his leg wound is completely healed. Sankie is doing marginally better. Her 85th birthday is tomorrow, so Barbara, Frances, and Dutch are going to drive down to visit her in Thomasville tomorrow evening.


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Tuesday, 26 February 2013

08:11 – We dodged the bullet again. When I woke up this morning, it was pouring rain and one degree above freezing. Barbara made a flying visit home last night after work. We had dinner and then she packed work clothes and her gym bag for today and took off to head over to her parents’ place to keep her dad company overnight. She’s taking him to the doctor this morning to get the paperwork done that he needs to get Medicare to approve a scooter.

I didn’t get as many containers filled yesterday as I’d planned because I ended up having a lot of other stuff going on. For one thing, I discovered I was short of caps for the 15 mL bottles. My vendor sells bottles and caps separately, and the numbers don’t correspond. For example, the 30 mL plastic bottles come 1,500/case but the caps for them come 1,440/case. That’s not so bad. I can keep those in close sync simply by ordering a case of bottles with a case of caps and an extra bag of 144 caps. Then, every once in a while, I’ll order a case of bottles without the extra bag of caps and things work out pretty closely. The 15 mL plastic bottles are more problematic. They come 1,100/case but their caps, different from the 30 mL caps, are still 1,440/case. So, unless I’m careful, sometimes we end up with a bunch of leftover bottles and sometimes a bunch of leftover caps.

So, we currently have one half-full case of 15 mL bottles and maybe 50 or 100 caps. I thought I had another case of 15 mL caps, but if so I can’t find it. So yesterday I ordered two cases of the 15 mL bottles and two cases of caps for them. That matches 2,200 bottles up with 2,880 caps, and should make things come out right. We needed more 15 mL bottles anyway, because Barbara will be starting on labeling new batches of bottles. Meanwhile, I got all the labeled 30 mL bottles filled yesterday, and would have started on the 15 mL bottles if I’d had caps for them. Oh, well. I have several hundred tubes to fill anyway, so I just changed gears and started filling tubes. And, with what we have on hand, those 2,200 15 mL bottles are enough for about 60 more chemistry kits and 60 more biology kits.


12:30 – Amazon has apparently created a monster with free Kindle books, and now they’re trying to clamp down by penalizing sites that feature their free ebook downloads. I’m not surprised. In the past year, I’ve downloaded close to 1,000 free Kindle ebooks. Well, 2,000 actually, because I download them for both my Kindle and Barbara’s. And even at that, I’m being pretty selective. I only click the link to view a book on Amazon if it looks like something we might want to read, and the sites that provide the link do some preliminary winnowing–minimum stars required to be listed and so on. On a typical day, that might mean I have a quick look at five or six books among the 50 to 100+ candidates. I then do a 15-second review of the description and number/average of the reviews. If it passes that test, I download a copy for me and one for Barbara. In the past, I’d typically download three of the final candidates; now I’m more selective and usually download only one or two a day. Then every couple or three weeks, Barbara will go through the titles I’ve gotten and winnow them further. The upshot is that we end up with maybe 1% of those free titles on our Kindles as final candidates. Then we read the first couple of chapters–or sometimes just the first couple of paragraphs–to decide if a book is worth spending any time on. Maybe a quarter of them are good enough to be keepers, and the vast majority of those are self-pubbed titles. So, overall, we actually end up reading maybe 0.25% of the featured free Kindle books. The good news for the winning authors is that we then usually go out and buy the rest of the titles in their series. But Amazon is doing its best to put a stop to all of this.

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Monday, 25 February 2013

09:40 – Barbara’s mom called Barbara’s cell phone again yesterday. When Barbara answered, her mom was just repeating Barbara’s cell phone number over and over again. Barbara couldn’t get her mother to respond, so she finally just hung up on her mom and called the nurses’ station. She ended up talking to her mom’s social worker, who interviewed Barbara about her mom’s medical and other history. The mystery of how Sankie was getting their phone numbers was cleared up when the social worker told Barbara that she’d seen Sankie wandering around carrying a slip of paper with phone numbers on it. Barbara told the social worker that she and her sister couldn’t take calls from their mom, particularly at work, and asked her to make sure that Sankie had only Dutch’s home phone number. Barbara is still hopeful that her mom will recover, of course, but I’m afraid that this is the new normal.

I’ll be spending some time this week filling bottles, thousands of them. I’m really glad I decided to buy that bottle-top dispenser. It speeds up filling immensely, even counting cleanup time between different solutions, particularly when I’m doing 60 to 240 bottles at a time. Meanwhile, I’ll also get labels printed for yet another batch of 60 chemistry kits and 60 biology kits. That’s about 5,000 container labels for Barbara to apply. Which means I need to get a few thousand more bottles and caps ordered.


17:01 – Well, the Italian elections are over, and if there’s one thing clear about this mess it’s that Italian voters have rejected “austerity” resoundingly. Bersani and his left-wing Democratic Party did much worse than expected, losing the Senate to a resurgent Berlusconi and his People of Freedom Party and winning only a 35% to 29% margin in the lower chamber. Former comedian Beppe Grillo and his Five Star Movement did much, much better than expected, with solid third place numbers in the polling. Mario Monte, the technocrat imposed on Italy by the EU, was a far distant fourth.

Bersani and Berlusconi hate each other’s guts and their parties’ policies are diametrically opposed, so there’s almost no chance that they will form a coalition. In essence, Italy is now without a government and is likely to remain so until new elections can be held later this year. Which means the ECB will no longer be propping up Italy’s bonds. Which means you can expect to see Italian bond yields start to skyrocket, sooner rather than later. Which means the euro crisis is back, bigger and badder than ever. Not that it was ever really gone. It was just smoldering. Watch it now, as it bursts back into flames worse than anything we saw at the “height” of the crisis. At this point, the most likely outcome is that Italy will crash out of the euro, returning to the lira, and default on its massive debt pile. The follow-on effects for Greece, Spain, Portugal, and France are likely to be catastrophic.

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