Reply To: Did You Know This? I Doubt It!

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At several hilly locations, known as “gravity hills,” objects such as cars left on neutral supposedly roll uphill, driven by unknown forces and against the force of gravity. Physicists say — and GPS measurements confirm — that the effects are illusions caused by the landscape. The position of trees and slopes of nearby scenery, or a curvy horizon line, can blend to trick the eye so that what looks uphill is actually downhill.