Saturday  31 Jul 2021           comment?

Monday  26 Jul 2021           comment?

Sunday  25 Jul 2021           comment?

The Basel Problem on the Berlin wall.

Around 30 years ago, I started writing e^πi + 1 = 0 in wet cement in San José, California. The crew that had poured the cement yelled at me and I ran away.

Tuesday  20 Jul 2021           1 comment

Saturday  17 Jul 2021           1 comment

Saturday  10 Jul 2021           comment?

Barometric pressure is lower at five feet off the ground than it is at four feet off the ground but the difference is small enough that it would seem negligible for all practical purposes. Yet it is that difference that makes a helium balloon rise.

Friday  09 Jul 2021           comment?

Wikipedia:

Pen-tailed treeshrews are the only known mammals that consume alcohol every night, other than humans.

Thursday  08 Jul 2021           comment?

YouTube recommended composer/pianist Frederic Rzewski to me after he died last month. In particular, they recommended his The People United Will Never Be Defeated! which is a large set of variations on a theme, ranging from dense and gnarly to rather accessible. Good stuff.

For a taste, try starting at variation 13 in a performance by Rzewski.