This year we've been keeping track of some of the surprising things that we have learned. For December, we're compiling a list of some of the things we've learned this year.
Here are the "Today I Learned", or TILs, from September 2021.
September 2, 2021:
TIL One inch of rainfall equals 4.7 gallons of water per square yard
TIL about hobby tunneling - people who dig tunnels for a hobby. https://en.wikipedia.org/wiki/Hobby_tunneling
The American engineer and supercomputer architect Seymour Cray is known to have been a hobby tunneller. Cray built an 8 by 4 feet …