The Tower of Terror ride at Disney World can lift 12 people 60 meters into the air. If the engineers assume that the average person has a mass of 60 kg What is the potential energy of a single person at the top of the ride?

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.

They all deal with hard evidence(scientific)