ancient history: poop and asteroids

Archaeologists can identify 2000-year-old latrines, and the people who used the one in this article were not allowed to poop on the Sabbath. They also managed to make sure they all had worms.

In other news, you can use Google Earth to identify characteristic sediment deposits left by super tsunamis, and from there you can identify craters in the ocean floor left by asteroids or comets. The most recent impact and giant tsunami occurred about 5000 years ago, and if you analyze 175 flood myths from around the world and appropriate astronomical data like when the most recent full solar eclipse was, you can come up with the morning of May 10, 2807 BC.