How would a vehicle slow or stop on time or on target without some mechanism to disengage the engine from the drive train?

Researchers discovered eight well-manufactured throwing spears in an Ice Age coal deposit near Schöningen, Germany. They are calling these the oldest human tools. What can forensic science reveal about the people who made them?

Scientists made a virtual microbe, complete with dozens of interconnected cell functions. But it wasn't easy. Their creation could be used in two important areas of research.