10-year-old app maker's plan: Change world, become turtle

Yuma Soerianto, a 10-year-old app developer from Melbourne, Australia, was the youngest attendee at Apple's developers' conference this week. He has created five apps currently in the App Store, and runs his own YouTube channel to teach coding.

He spoke to the BBC's Dave Lee about his skills, ideas, and what he wants to be when he grows up.