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"Human beings had a play-based childhood from time immemorial," says author Jonathan Haidt. What caused teen mental health decline is "between 2010 and 2015, phones, screens come sweeping in The most important thing that parents can do is delay the age at which their child gets immersed in internet culture."

Fareed hosts a spirited debate on the House bill that could lead to a US ban on TikTok, with the American Enterprise Institute's Kori Schake and Glen Gerstell, former general counsel for the National Security Agency. They discuss national-security risks the Chinese-owned app might pose given its many American users.

A new government report warns that advanced Artificial Intelligence systems could pose an "extinction-level threat" to humans, and that the US must intervene. "I think we should be mindful of it," says Ret. Admiral James Stavridis. But he adds, "there have been big inventions in the past - the printing press, electricity, the internet - all of these have been a decried for the possibility of nefarious activity."

CNN was at the inaugural event of one of the world's biggest tech shows, which casts a spotlight on the region's thriving startup ecosystem.

President and CEO of Computer & Communications Industry Association Matt Schruers joins The Lead.