helmets

A one-minute skateboarding clip with a wreck in which a helmet likely prevented serious injury. It shows downhill longboarding without brakes.

Copenhagen's bicycle ambassador Mikael Colville-Andersen argues in a TEDx talk that bicycle helmets threaten bicycle culture. He says they distract from road design and make cycling look dangerous.

Lex Fridman interviews Bryan Johnson, founder of Kernel and previously Braintree, about brain-computer interfaces and Kernel's non-invasive brain monitoring hardware. It covers what the devices can do today and the company's plans.

A sped-up two-minute view of morning rush hour at a busy Utrecht junction, where thousands of bicycles and buses pass each day. It illustrates a city where about a third of trips are by bike.

A short Streetfilms montage of Vredenburg in Utrecht, a car-free street carrying about 33,000 cyclists a day. It shows heavy bike traffic alongside pedestrians and buses.