Category: science kits

Friday, 7 September 2012

09:19 – Things are slow at work, so Barbara decided to take today off. Her parents are starting their move this weekend from their house to the retirement facility. For now, they’ll be moving into a guest apartment temporarily while the one they’ll ultimately be in is cleaned and painted. We’ve been accumulating boxes for the move, which is no problem at all here, with science kit component shipments arriving frequently. Barbara just hauled a load over to her parents’ house, where she’ll spend the day helping them get some of their stuff packed up and ready to move tomorrow.

Science kit sales have been erratic. Some days, we sell only one or two science kits, or even none. Other days, we sell five or eight kits. As of now, we’re still in relatively good shape on biology and forensic science kits, but we’re down to half a dozen finished chemistry kits in stock. Fortunately, we have a dozen more that just need to be boxed up and 30 more after that in progress. The biology kits worry me a bit. We have about 20 of those in stock, but once we run dry we have to start from scratch to build a new batch. That means making up and bottling a bunch of chemicals and so on. So I guess we’d better get started on a new batch of at least 30. I’ll probably make up and bottle sufficient chemicals for 60 kits and leave the extra 30 sets of chemicals in stock when we build a batch of 30 kits. That makes it a lot quicker to build another batch of 30.

I remember the first time we had an order from the same person for both a chemistry kit and a biology kit. That happens relatively frequently, but I thought it might be a while before one person ordered all three of the kits in one order. That happened this morning for the first time. I just thought how I’d have reacted as a teenager or even an adult to have all three of these kits show up at the door. It’d be like Christmas in September.


10:39 – Wow. Drew Peterson convicted of murder on literally zero evidence. I haven’t really followed the case, but my sense of it from what I’ve read is that he probably is guilty. But this prosecution violates what had until now been a sacrosanct principle of criminal law: hearsay evidence is not evidence at all. The state had to pass a special law to allow hearsay to be admitted in Peterson’s trial. Otherwise, the prosecution had no case. Since the beginnings of our legal system, it’s been a fundamental precept that “better 100 guilty men go free than one innocent man be convicted”. It is up to the state to prove the guilt of a criminal defendant beyond a reasonable doubt. There is nothing about this case but reasonable doubt, but in its determination to convict this guy no matter what, the prosecution (i.e., the government) managed to get the rules changed. This fundamental violation of legal principles may come back to haunt us. It’s a small step from this to the Star Chamber.

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Wednesday, 5 September 2012

09:46 – I’m still hard at work on designing new science kits for later this year and early next, not to mention roughing out documentation for them. For the time being, we’re in reasonably good shape in terms of finished-goods inventory on all three kits, although we’ll start another batch of chemistry kits this coming weekend.

Meanwhile, I’m staying indoors as much as possible. It’s miserable outside. The high temperatures haven’t been bad–typically mid- to upper-80’s (~ 30 to 32C)–but the humidity is hideous. Since the first of August, our rain gauges have registered more than 14 inches (~ 36 cm) of rain. (The official total at the airport is 10.32 inches, but we’ve gotten more.) Just as I do every summer, I think about how nice it would be to live in a cooler climate.


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Tuesday, 4 September 2012

09:53 – Kit sales have slowed down, but I’m not sure if it’s just the holiday weekend or the fact that most kids are back in school now. We sold one Saturday, two Sunday, one yesterday, and two so far today, for a total of six kits or 1.5 per day for the month to date. Of course, we’re only three+ days into the month, so even a couple more kits today could take us up to 2/day or 60/month average. My original goal for calendar year 2012, our first full year, was 250+ total kits, which we’ll make easily. Next year, I’d like to see us do 500+. Having two more kits available should help us make that.


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Saturday, 1 September 2012

08:38 – We made the 31 August deadline to start shipping forensic science kits.

Barbara had a relaxing day off yesterday, and was delighted when she arrived home to find the new deck complete. We downsized significantly. The old deck was 16×20 feet (about 4.9 x 6.1 meters). The new one is 10×12 feet (about 3 x 3.7 meters). That’s big enough, because we very seldom have more than one or at most two other couples over. Mainly, Barbara just wanted room for a gas grill and and small table and chairs. She likes to sit out on the deck and read during pleasant weather.

I spent some time yesterday roughing out a couple of new science kits. I’ll have to write manuals for both, which will be the major time commitment. Mary Chervenak suggested our next kit should be one that focuses on advanced biology, with an emphasis on recombinant DNA, gene manipulation, and so on. That’s tempting from an intellectual point of view, and I suppose we could position it as an AP Biology kit, but I have to think through all the implications before we proceed with it. But it’s definitely a candidate, along with AP chemistry, first-year physics, earth science, and physical science (which is basically a combined introduction to biology, chemistry, and physics).


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Friday, 31 August 2012

09:05 – Barbara is taking a well-deserved personal day. She left at oh-dark-thirty to meet her friend Bonnie and drive up to a flea market in Hillsville, Virginia. The deck guys are supposed to finish up today. It’ll be nice to have some peace and quiet around here. The saws and nail guns make it hard to concentrate.

Now that we’re officially in-stock and shipping forensic science kits, Barbara suggested that I take it easy today. I may do that, although I’m already thinking about our next science kit and may start preliminary work on it. In one year, we’ve gone from having just the chemistry kit to having chemistry, biology, and forensic science kits. I’d like to have a fourth kit available by the end of this year, and a fifth by next summer. I’m not sure yet what they’ll be.


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Thursday, 30 August 2012

07:41 – Barbara is taking today and tomorrow off work to give her a five-day weekend. We’ll get a dozen or so forensic science kits boxed up today and ready to ship tomorrow. That’ll cover outstanding back-orders and give us a reserve of built kits. We’ll build the remainder of the first batch of 30 over the next week. Then it’ll be back to building a new batch of biology kits, our stock of which is getting smaller. And then more chemistry kits.

The deck guys worked only until noon yesterday, by which time they’d torn down and removed the old deck and put in footings for the new columns. Those have to be inspected before they can frame out the deck. They should finish the project tomorrow.


12:16 – I just updated the forensic science kit page to say that we’re now in-stock and shipping. That’s true in the sense that we’ll have kits available tomorrow, which is the earliest we could ship anyway. We’ll ship outstanding backorders tomorrow and will be ready to ship any orders received from now on.

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Wednesday, 29 August 2012

09:18 – We’re having our deck replaced. Yesterday, a truck showed up with the framing lumber. This morning, the work crew showed up to tear down the old deck. We had just under five inches (~12.5 cm) of rain last night, but our back yard is on a grade so it’s drained well enough for them to start work.

We’re nearly ready to start shipping forensic science kits. I have a couple more chemicals to bottle and then we’ll start building subassemblies. Until we get all of the subassemblies ready to go, we won’t know what size box we’ll need. I’m sure everything will fit in a USPS Priority Mail large flat-rate box, but I’m hoping it’ll fit a PM regional rate box instead. If so, that’ll cut our postage costs by an average of maybe $3.

I’d intended to drop our wired phone service and go 100% cell. But thinking about it this morning, I decided to sign up for a third-party VoIP service. I looked at Vonage, but I decided to reactivate our service with PhonePower, which we had before we went to TWC VoIP service. PhonePower service was great for a few months, but then it started hanging unpredictably. I think the problem was the terminal adapter. The one we had back then had to be on the local side of the router. The TA we’re getting this time sits between the cable modem and the router, so there shouldn’t be any problems with hangs.


16:39 – When we’re making up chemicals for kits, I invariably save the most obnoxious chemicals for last. This time was no exception. I just finished making up a batch of Kastle-Meyer reagent, which is used as a presumptive blood test. Actually, K-M reagent isn’t as obnoxious as some. It has no odor. The obnoxious part is having to reflux a 40% potassium hydroxide solution, which literally eats glass.

I originally intended to make up a 2-liter batch, but I decided one liter was sufficient for this pass. That’s enough for 30 forensic science kits, which is the batch size we have in progress. So I halved the recipe, transferring 500 mL of DI water to a 2 L Erlenmeyer flask, dissolving 200 g of potassium hydroxide in the water, adding 20 g of phenolphthalein powder and 200 g of zinc powder, and then refluxing it for an hour or so, until the bright pink solution turned colorless. That’s cooling down now. When it’s at room temperature, I’ll make it up to 1 L with 70% ethanol and bottle it. Some sources say that K-M reagent is good for months stored in a sealed bottle, or years if it’s refrigerated. My experience has been better than that. I have some K-M reagent I made up in 2007. It’s been stored at room temperature, and it still works the same way it always did.

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Tuesday, 28 August 2012

08:15 – Today was the day we intended to start shipping forensic science kits. We’re not going to make that deadline, but we will be shipping them by this Friday, the 31st.

I got an email this morning, apparently from Time-Warner Cable, saying that our account was past-due and that if we didn’t pay the balance they’d discontinue service. So I called their support number and bounced around through the menu system. It sounded like our account was current, but just in case I decided to wait on hold to talk to an agent. She told me that that notice was legitimate but should never have been sent. Apparently, when Barbara wrote a check to TWC earlier this month, she wrote it for $0.01 less than the actual amount of the bill. The customer service woman said not to worry about it, that they’d just tack the $0.01 onto our next bill. Fine.

But while I was bouncing around the menu tree, I’d chosen the option to check our account balance. It told me we were current, but mentioned that we had a promotional deal that was due to expire soon. When I spoke to the customer service woman, I asked about that. We’re currently paying $36/month for TWC VoIP telephone service, which I think is outrageous enough. That deal expires the end of this month, and they’ll start charging us $45/month. So, while Barbara was getting dressed to go to work, I walked back and suggested that we drop our land-line service, as so many of our friends and acquaintances have. She said that was fine with her. With her parents’ health issues over the last several months, she’s gotten used to depending on her cell phone anyway. I told her we’d just move our phone chargers back to our nightstands and leave our cell phones on 24 hours.


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Monday, 27 August 2012

07:45 – We’re working hard to get the first batch of forensic science kits ready to ship this week. Much remains to be done, but we’ll have a batch ready to ship later this week.


13:21 – Geez. After nearly melting a PET bottle a few days ago, you’d think I’d learn. Apparently not. I was making up Herzberg’s Stain this morning, using the saturated zinc chloride solution I made up a few days ago.

The instructions call for 125 mL of an iodine/iodide solution made up by dissolving 52.5 g of potassium iodide in 50 mL of water, adding 2.5 g of iodine crystals, swirling until they dissolve, and then making up the solution to 125 mL with water. That solution is mixed with 250 mL of saturated zinc chloride. So I carefully measured that amount of the zinc chloride solution and transferred it to a PET bottle. I then added the 125 mL of IKI solution with swirling. Of course, the solution immediately started heating up. Duh. So I quickly poured it into a polypropylene beaker and covered it with a watch glass so that it could cool down. Geez.

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Sunday, 26 August 2012

08:07 – Barbara returned mid-afternoon yesterday from the visit to one of the retirement facilities she and her sister had short-listed. The good news is that her parents loved the place and are excited about moving in. This is the facility that has one unit dedicated as guest/trial quarters. The actual unit her parents would be moving into isn’t ready for occupancy yet, so the facility manager suggested that her parents could move temporarily into the guest unit while the unit they’ll actually occupy is being cleaned up and painted. The monthly cost is a bit more than their monthly income, but VA will pay a portion of that cost and they do have savings and other assets, including their house, which will offset the difference. Barbara is going to talk to the VA Monday to find out exactly how much they’ll pay toward the monthly cost, but it looks doable. Now the trick is to get things rolling before Barbara’s parents have second thoughts or another medical emergency occurs.

While we were walking Colin last night, he stood and urinated for about a solid minute. Barbara commented about the strong smell of his urine and wondered if he had a urinary tract infection. He’s been acting a bit strangely for the last week or so, including having accidents (solid, not liquid) in the house. That’s one possible symptom of a UTI. UTIs in dogs can be very subtle, so I decided to start him on amoxicillin immediately. I gave him 1,000 mg as a loading dose last night. When he urinated this morning there was no strong odor, which suggests the amoxicillin has already knocked down the infection. We’ll give him 500 mg tid for the next few days, and then I’ll do a microscopic examination of his urine and an occult blood test. If that’s clear, we’ll assume the amoxicillin is working and continue it 500 mg bid for a couple more weeks. Then I’ll do a urine culture, just to make sure.

We’re making good progress on the first batch of 30 forensic science kits, and should be able to start shipping them by the end of the month.


15:47 – I decided to boost Colin to 750 mg tid. Years ago, I treated another of our dogs for some sort of infection. I followed the canine recommendations of the Merck Veterinary Manual, which IIRC were 5 to 7.5 mg/kg amoxicillin bid. The infection did not clear up, and when we took the dog to see Sue Stephens, our vet, she said that dosage was very low. So I looked elsewhere for the amoxicillin dosage for canine UTIs, and came up with a range of 10 to 25 mg/kg bid. For Colin, at about 32 kilos, that’d be 320 to 800 mg bid. So, although 500 mg is well within that range, I decided to go nearer the upper end. In fact, Colin tolerates a 1,000 mg dose without any problem, so I decided to go with 750 mg tid for the first couple of days and then 750 mg bid for the remainder of the two weeks or so.

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