I don't know what other people did on Easter, but I spent a good chunk of the afternoon teaching Evangeline how to burn down the driveway.
The actual intent was to teach her a little applied optics, and show her how to use a magnifying glass to focus the sun's rays and do a little wood-burning. We have a cord or more of uncut firewood lying in the driveway from a tree we had cut down last fall, and I figured this would be a fun way to mix science and art.
That was my intent, but intent and practice so rarely meet that I suppose I should have known better.
What happened was this: I showed her a magnifying glass works by focusing the sun's light into a point so focused that it provides enough energy to burn wood. I burnt my initials into a large log, and then let her have a go.
What happened next is my own fault. Being the sort of father I am, once I saw that Evangeline had the idea, I started doing little things to aggravate her, like putting a stray crayon into her makeshift laser and making it melt. "Da-ad!" she moaned. (I've not quite stopped being "daddy" where she's concerned, but I'm afraid it's happening.)
Once she finished her first initial, I got the glass back so I could over my initials again and make them more solid. And she got back at me. Almost immediately, she slid a dry leaf into the beam and then gave a small cry of surprise as the leaf burst into flames.
Duly impressed with the power of a magnifying glass, Evangeline and I both avoided doing anything else of the sort the rest of the afternoon. She finished her initials, saw the other applications of starting a campfire without matches and of burning actual art into wood, and went back inside with me, appreciating that the firestarting power of a magnifying glass is like that of matches: Use neither without an adult's supervision, and don't play with them.
But I'm wondering about the other lessons I've been teaching her. First it was burglary. Now it's arson.
I'm afraid to find out what's next.
Copyright © 2008 by David Learn. Used with permission.
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Showing posts with label science projects. Show all posts
Showing posts with label science projects. Show all posts
Monday, March 24, 2008
Thursday, April 19, 2007
sourdough
Trying something new today -- sourdough bread.
I came across a fairly straightforward how-to guide on the Internet a while ago, and so a few days ago, the girls and I put a cup of flour into a clear plastic container, mixed it with a cup of warm water, and let it sit out on the kitchen table as a makeshift science project. A day later or so, a brown liquid, called hooch, had started to pool on top of the project. We poured it off, tossed half the mixture, and added another half-cup each of flour and water, and repeated the process for another two days.
Yesterday we used half the science project -- or "our pet," as we're calling it -- to make a pizza dough. And added more water, and more flour. I left the stuff sit out again overnight last night, and this morning took half of it, added some more flour and started making bread out of it. The rest, as you can guess, we put back into its plastic container, which we had washed out, and gave it more water and flour.
It took about twice as long to rise as bread I've made with packets of yeast I bought at the supermarket, but the sourdough is growing pretty well. I'm planning to bake it this evening, and have it for dinner with whatever else we eat. It's bread, the way people made it for thousands of years, with a slight beer taste.
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