Electric currents are induced in aluminum by a moving/time-variant magnetic field, producing forces opposing the moving/time-variant magnetic field. It'* actually a really cool effect -- this effect is used for the primary braking system on rides like "Drop Zone" at King'* Island.

People have known that Earth is round for thousands of years. In fact, back in 200 BC, the Greek astronomer Eratosthenes calculated the Earth'* circumference

Sorry, pet peeve about the earth thing....

Sensor'* in the bumpers and receivers in the road. It would be a smart system . Lot'* of $$$$$ , but what about the tree'*

Hey It seems hard to believe but there was once a time with no internal combustion engines(NO BONNIES!!! ) So I guess stranger things could happen.

sounds alot like MAG-LEV...same technology they use for trains in Europe...I my self..I'll keep my Bonne'