When it comes to kids and smartphones, they know how to use 'em better than many adults.

Exhibit A:

I woke this morning to find my 7 y/o levering my finger onto the TouchID sensor of my phone. Maybe time to go back to passwords.

— Matthew Green (@matthew_d_green) November 25, 2014 [1]

For background, Matthew Green teaches cryptography at Johns Hopkins University and is a privacy expert. But clearly, he couldn't outsmart his 7-year-old son who just wanted to play some games on his iPhone 6 Plus and snuck into his parents' room, grabbed his dad's thumb, and pressed it on the fingerprint detector.

So to those who think the iPhone encryption is indestructible or a threat to the law [2]: think again.