![Nature Podcast show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/030/798/small/nature-podcast.jpg)
Summary: 31 July: This week, replaying evolution in the lab, dam-busting to let rivers run free, and the time when asteroids boiled the Earth’s oceans.
Summary: 31 July: This week, replaying evolution in the lab, dam-busting to let rivers run free, and the time when asteroids boiled the Earth’s oceans.