Life as we know it needs water, but scientists can’t figure out where Earth’s water came from. Answering that question is just one piece of an even bigger mystery: “Why are we here?” This is the first episode in our new three-part series, Origins, about the beginnings and boundaries of life on Earth. For more, go to http://vox.com/unexplainable It’s a great place to view show transcripts and read more about the topics on our show. Also, email us! unexplainable@vox.com We read every email. Support Unexplainable by making a financial contribution to Vox! bit.ly/givepodcasts Learn more about your ad choices. Visit podcastchoices.com/adchoices