Build series and parallel circuits with a couple of AA batteries, then see for yourself why one keeps working when a bulb fails and the other goes dark.

Choosing a home-education microscope comes down to what you want to look at and how much you want to spend. Here's how USB, stereo and compound models compare.

Build a rain gauge, cup anemometer and wind vane from household materials, calibrate them properly, and keep a daily weather log that actually tells you something.