While the younger two are learning about birds and insects, Peter is tackling physical science for his final year of middle school.

I recorded his most recent experiment, with Jeremy as his assistant. Peter collected oxygen in the balloon after combining hydrogen peroxide and yeast.

I sent the video to Jake, who reminded us that the overabundance of oxygen in the Apollo 1 space capsule was a major contributing factor in the fiery death of three astronauts 50 years ago.