Reaction wheels are useful things, typically used by satellites to keep themselves oriented the right way up in space. Turning the reaction wheel creates an equal and opposite torque in the spacecraft ...

Aaron Hankin is currently working for Dow Jones MarketWatch. He has 10+ years of professional experience in the financial markets. The U.S. economy seems to be doing fine. Growth, for the most part ...

The story of the highly skilled workers who helped build Egypt’s Great Pyramid is emerging from a papyrus cache unearthed at the world’s oldest harbor On a summer afternoon around 4,600 years ago, ...