Episode 22 of The New Screen Savers is here! In this episode, Leo Laporte is joined by co-host Jason Calacanis.  In this episode, you get to hear from the man who found water on Mars, you get to see the 8th grade teacher who mixes science with rap, plus learn how you can use your smartphone to test your heart rate, track your sleep, and check out the gunk in your ears, enjoy!

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