What is the most interesting fact you've learned recently?

This thread is regularly updated and posted in lots of different niches. Feel free to suggest more!<br><br>**This thread asks:** Recently discovered something interesting. What is it?<br><br>**Example:**<br><br>* **Recently discovered** that the ancient Greeks thought ant hills were the remains of the battles of the great hero Antaeus. He was the son of the earth god, and when he was killed by Hercules he bled so much that ants formed hill where his blood filled up.<br>* **Source:**<br><br>I'd also like to share a few of my own recent discoveries for your enjoyment:<br><br>**Recently read** All the Light We Cannot See by Anthony Doerr. It tells the story of two teenagers on opposite sides of the front lines during WW2: a German soldier and a young French girl who is imprisoned by the occupiers. The story begins just inside the French border in 1939 and ends in July 1944 with the Allied invasion of Normandy. The novel won the Pulitzer in 2015.<br><br>The book is so well-written, and the history is so interesting and sad and beautiful that I couldn't believe it wasn't better known. I have recommended it to maybe 20 people and everyone has loved it.<br><br>When the Allies invaded, the little French girl is hiding in the cathedral of St. Petres in occupied Lille, France. The book describes what the cathedral was like during the bombing of Lille. It also vividly describes the liberation of the city. <br><br>If you enjoy ww2 history, I think you should know about this book.