Amazing energy saving staircase.

Georgia Tech and Emory University research team have created a device that makes walking up and down stairs easier. It is meant to save user’s energy during walking-down and return energy to the user during Walking-up.
The spring-loaded stairs compress when someone comes down the stairs, saving energy otherwise dissipated through impact and braking forces at the ankle by 26 percent. When going up, the stairs give people a boost by releasing the stored energy, making it 37 percent easier on the knee than using conventional stairs. The low-power device can be placed on existing staircases and doesn’t have to be permanently installed.

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