Maybe young brains really are best suited for tackling global challenges like health and environmental concerns.

Trains carry serious freight but aren’t really energy efficient. That could change in the future, though, thanks to a new design idea for powering them. Instead of relying on an electrical current or diesel, as trains in the U.S. do, this new concept would run a simplified air circuit alongside the tracks. It’d look kind of like the Hyperloop, but instead of blasting pods filled with passengers through this circuit, train operators would simply fire a projectile outfitted with a strong magnet along the route. The main idea: This magnet could be strong enough to pull a train along with it, therefore saving energy.

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