Scientists have demonstrated that an ordinary airplane flight is like a brief visit to the Fountain of youth. In 1972, for example, scientists who took four atomic clocks on an airplane trip around the world discovered that the moving clocks moved slightly slower than atomic clocks which had remained on the ground. If you fly around the world, preferably going eastward to gain the advantage of the added motion of the Earth's rotation, the atomic clocks show that you'll be younger by only 40 billionths of a second. Even such an infinitesimal saving of time proves that time can be stretched. Moreover, atomic clocks have demonstrated that the stretching of time increases with speed.