Tetrataenite, an iron-nickel alloy.

Just to respond to your need for better sleep… For me, good sleep is far more about temperature, darkness, and a nice weight. So I use a weighted blanket, eye covers, and the expensive but awesome chilipad so I don’t try to sleep in a pool of sweat.

Momo by Michael Ende. He also wrote The Neverending Story. Where The Neverending Story is about imagination, Momo is about listening and time.

I love that book! I try to read it once a year to keep the ideas lodged in my brain.