Astynax

First, some examples. In my beginning programming classes, I tell students (and show them): write comments first, before coding. Some won't. I tell them: write the algorithm first. I prove this will save them time. There's a whole chapter on why and how to do this. Many won't. (Except twice,...

I saw some time ago Carl Sagan asked schoolchildren for proofs that the earth is round. I can no longer find it, but they gave him sound, simple answers. One was watching a ship seem to sink below the horizon as it grows distant. One was photos of Earth from...