Although it has been out of the headlines lately, the Hyperloop—Elon Musk's futuristic vision of a San Francisco-Los Angeles connector made of pneumatic tubes—hasn't disappeared. A program at UCLA is currently focusing on developing the Hyperloop, although the program's leader recently called the idea "insane" while simultaneously insisting that the physics behind it are sound. Some of the biggest challenges facing the system are how to locate Hyperloop stations within cities and how to keep passengers from suffering serious Hyperloop-sickness when the system exerts a powerful set of forces on their bodies during travel. [CityLab]
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