Gravity Could Solve Clean Energy’s One Major Drawback

Gravity Could Solve Clean Energy’s One Major Drawback

As each block descends, the motors that lift the blocks start spinning in reverse, generating electricity that courses through the thick cables running down the side of the crane and onto the power grid.

How to Watch NASA Launch Its New Perseverance Mars Rover

How to Watch NASA Launch Its New Perseverance Mars Rover

The skycrane is outfitted with eight small engines that start firing when the rover is about half a mile up to rapidly slow its fall to just a few miles per hour.“These particular engines are actually a derivative of the original engines developed for Viking landers in the early ’70s, but we've made very significant upgrades,” says Fred Wilson, a propulsion expert at Aerojet Rocketdyne, the company that made the propulsion system for the Perseverance landing system.

David Makes Man Invents a Doorway to a New Kind of TV

David Makes Man Invents a Doorway to a New Kind of TV

But the very nature of David Makes Man both invents a doorway into something new and rebels against a genre of TV-making that has historically cast out the stories of black teen boys.