Astronauts left something on the moon that could help unlock the origins of life itself.

For more, go to http://vox.com/unexplainable

It’s a great place to sign up for our newsletter, view show transcripts, and read more about the topics on our show.

Also, email us! unexplainable@vox.com

We read every email.

We are conducting an audience survey to better serve you. It takes about five minutes, and it really helps out the show. Please take our survey here: vox.com/survey

Support Unexplainable by making a financial contribution to Vox! bit.ly/givepodcasts

Learn more about your ad choices. Visit podcastchoices.com/adchoices