elevator motor generator returns electricity counterweight

Some elevators send electricity back to the building

An elevator can return electricity to its building when a cab heavier than its balancing weight descends, or a lighter cab rises. The motor then acts as a generator, recovering gravitational energy much like regenerative braking in a vehicle.

Wildebeest migrate thousands of kilometres for food and water

~2 million each year

Huge herds of wildebeest migrate between Tanzania’s Serengeti and Kenya’s Masai Mara in search of food and water, traveling roughly 2,900 kilometres along their annual route.

Some people see a faint glow when X-rays pass through their eyes

Observers exposed to sufficiently intense X-rays have sometimes reported a dim glow, especially after adapting to darkness. Researchers have proposed several explanations, including visible light produced within the eye by radiation. The phenomenon is unusual because X-rays themselves lie outside the wavelengths human eyes normally detect.

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elevator motor generator returns electricity counterweight

Some elevators send electricity back to the building

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