Hyperloop
Hyperloop is a new mode of transport first envisioned by Tesla and Space CEO Elon Musk. It consists of a low-pressure environment taking the form of a tube in which pods travel at high-speed.
Several people brought forward similar ideas, but the term and specific system was first revealed to the public in a white paper published by Musk and a few engineers at Tesla and SpaceX in 2013.
He open-sourced the concept and several startups have since launched efforts to make the concept a reality.