50 Experiments [scroll down about 1/3]
is for adults, too. Simple explanations and examples for a variety of concepts. Speed of light? Disease? I had used a shower curtain as an example for principles of flight, but these cover even more principles.
The best part is the experiments: 50 of them that kids can do at home to illustrate those principles. He makes them more exciting by rating them from one to four on a Catastrophic Meter Chart, with one representing “no risk of catastrophe” and four representing “high risk: involves use of fire, lot liquids, or hazardous substances. Adult supervision required.” Some of them are delightfully messy, like creating avalanches with sugar and flour, spilling water, and counting how many popcorn kernels pop out of an open pan per unit of time to demonstrate what radioactive half-life means. You can extract DNA in a kitchen experiment. You can measure the speed of light by melting marshmallows in the microwave oven. You can create a fossil. You can send a toy soldier aloft in a hot air trash bag balloon. You can build a soda bottle rocket. You can shock your tongue with a battery you make yourself from a stack of nickels and pennies.