When you think of echolocation, you probably think of bats or dolphins. But echolocation has also been used as a way for blind people to navigate, too. Despite the skill's usefulness, few blind people ...

Mattias Krantz is a YouTuber with a penchant for bonkers engineering and musical projects. A few months ago, he went into a wet market looking not for lunch, but for a potential prodigy. Krantz wanted ...