View Full Version : Cool interesting facts

05-22-2006, 08:27 AM
Adjustable Tires
The High Mobility Multi-Purpose Wheeled Vehicle (HMMWV) or Hummer is a highly durable motor vehicle that was originally designed for military use. A Hummer has the ability to change tire pressure while it is moving, making it practical for travel across loose surfaces like sand dunes.
The Hummer was designed to be dropped by parachute and land on its wheels unharmed. Its other interesting talents include a winch powerful enough to suspend the vehicle in midair, and, in the military version, the ability to ford streams as deep as 60 inches (150 centimeters).
The civilian version of the Hummer, which became available in 1992, is not available with a machine gun or rocket launcher, but it is just as durable as the military version.
(Hummer is a trademark of AM General.)

Atomic Clocks
The most accurate clocks in the world are atomic clocks, which use the vibrations of atoms to keep track of the time. They are so accurate that they would gain or lose only one second in three million years.
Most clocks use mechanical or electronic oscillators (vibrators) to count out a fixed number of "ticks" per second. The oscillators are not all exactly the same, so ordinary clocks must be periodically reset.
Atomic clocks use the absolutely stable vibrations of atoms (usually cesium atoms). Since every atom of the same type vibrates exactly the same number of times each second, atomic clocks are extremely accurate.
The largest error in the best atomic clocks comes from slight variations in how the atoms are moving as their vibrations are measured. New atomic clocks will slow the atoms down almost to a stop, making them up to 10,000 times more accurate than today's models.