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
Interferometry 1: Make a Two-Beam Interferometer
See the wave nature of light with pinholes in aluminum foil.
Time and Frequency
How to Set Your Wristwatch to Extremely High Accuracy
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.