The wheel has undoubtedly been among the most significant of human inventions. Prior to its invention, population growth was limited, because people could not move easily to find more food and water once their resources had been diminished. The...

The wheel and axle is a simple machine. It consists of a wheel that turns an axle, or an axle that turns a wheel. It is also a lever that turns in circles around a point or fulcrum. The load on the axle is more easily moved because of mechanical...

House Democrats called for better inspections and tougher standards for bus operators Tuesday after the recent crash in Atlanta that left five college baseball players dead.In a House hearing that highlighted partisan differences over government regulation versus free-market forces, Rep. Peter DeFazio, D-Ore., asked why...

Two U.S. senators, motivated by a bus crash that killed five college baseball players, on Thursday proposed requiring seat belts on long-haul buses.The proposed legislation also would require changes to bus windows that would help prevent passengers from being thrown out of the vehicles during...