Lever a place to stand, and I shall move the Earth with it' is a remark of Archimedes who formally stated the correct mathematical principle of levers (quoted by Pappus of Alexandria). It is assumed that in ancient Egypt, constructors used the lever to move and uplift obelisks weighing more than 100 tons. A lever is a beam connected to ground by a hinge, or pivot, called a fulcrum. The ideal lever does not dissipate or store energy, which means there is no friction in the hinge or bending in the beam. In this case, the power into the lever equals
The Prince Who Wanted to See the World The Prince Who Wanted to See the World The Prince Who Wanted to See the World is a Portuguese fairy tale. Andrew Lang included it in "The Violet Fairy Book". A king's only son wanted to see the world and was so persistent that his father let him go. He played cards with a stranger and lost all his money; then the stranger offered to give it back on another game, but if the prince lost, he would have stay at the inn for three years and then be his servant for three years. The prince agreed and lost. After