Two scientists. A billion-dollar wager. One unanswered question: Is the first human who will live to 150 already alive? The technology to make that happen may already be in development. But if it works, there will be new, unsettling questions for humankind to answer.

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! [email protected]

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