Hands-On Science
These are intended to be short vignettes of interesting, practical science
and technology accessible to middle-school and high-school students.
Not enough emphasis these days on building real hardware, observing
real effects, playing with real data. Much can be done with
small resources.
Optics
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Interferometry 1: Make a Two-Beam Interferometer
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See the wave nature of light with pinholes in aluminum foil.
Time and Frequency
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How to Set Your Wristwatch to Extremely High Accuracy
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Ordinary LCD wristwaches can be accurate to one or two
seconds a month, though they're rarely that good
right out of the box. Here's how to fine-tune them.
Never lose another "whose watch is correct?" argument.