Rio has received London's top tips on how to run a smooth transport system ahead of the 2016 Olympic and Paralympic Games.

BBC: London gives top transport tips for Rio 2016

Locals have caught peeks of the final product over the past couple of months as producers tested the lighting system ahead of the big debut.

CNN: San Francisco turns a bridge into art with 25,000 lights

One of the loudest cheers came for a 14-year-old Brazilian boy who had used Arduino to create an earthquake prediction system ahead of the government.

BBC: TEDGlobal: Burns portrait comes alive at TED