I’m on a summer break, reading and listening in ways that I wish I usually had more hours in the week to read and listen. Here are two lovely pieces of information I’ve heard/read this week. 1. Birds have relatively bigger hearts than non-flying animals. A big heart is required, in order to fly. (How do birds fly? - ABC Kids Listen)

2. A 2009 study suggests that humans glow at 1000 times lower than the density of what our eyes can detect. (P.8. Phosphorescence - Baird).