a magnifying glass; I loved mine as a kid
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a laser thermometer. Big fun.
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Also, a laser distance measure.
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With the help of a friend: Hardware: a bluetooth dongle for car's obd-ii port; green lasers; supermagnets; dry ice; Dobsian reflector? Software: switching to Dvorak, a stack-based calculator, a REPL; free sleep monitor apps
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Diffraction grating. Lets you see spectrum of things easily, cost a few $ per square meter.
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Neuroscience for anyone (who can stomach working with cockroaches)! https://backyardbrains.com/products/
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Oh, it seems they've now also developed kits for those much more innocent and fun little plants that fold up when you touch them. Way better than putting a cockroach in the freezer and sticking an electrode into its leg. But they also do a remote-control roach kit. Really cool.
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potatoes generate electricity while still being edible, unlike other batteries, and are often within affordability
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It’s out of print but if you can find a good used copy of The Explorabook from Klutz books that still has all the stuff, it’s amazing. A “science museum in a book”. Full of interactive pages and experiments. I was utterly enthralled as a kid.
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A barometer is mystical. The cheap homemade ones, probably more so.
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