Jacob Collier is a one-man band and force of nature. In a dynamic, colorful performance, he recreates the magical room at his home in London where he produces music, performing three songs in which he sings every part and plays every instrument -- accompanied by kaleidoscopic visuals that take cues from the music and grow in real time.

From his home in London, Jacob Collier showcases his virtuosic vocal, piano and guitar skills in an enrapturing five-song set. Stick around to hear him premiere a new original track, "The Sun Is in Your Eyes," and sing a gorgeous rendition of "Danny Boy."

As kids, play comes naturally. But over time, it gets replaced by work. This hour, TED speakers explore how to reconnect with play -- to spark creativity, combat despair and find our way in the world. In this segment, host Manoush Zomorodi talks to Grammy winner Jacob Collier, who makes a case for why we should emphasize play, passion and curios...

As COVID-19 continues to spread, the world is facing two existential threats at once: a public health emergency and an economic crisis. Political theorist Danielle Allen describes how we can ethically and democratically address both problems by scaling up "smart testing," which would track positive cases with peer-to-peer software on people's ce...