Most videoconferencing designs, which put the camera above or to the side of the screen, prevent you from making eye contact with the other participants. Research is underway to give participants true eye-to-eye communication.
A seemingly miraculous plastic invented in the late 1980s appeared to be completely fireproof and a nearly perfect insulator, capable of withstanding 10,000°C without breaking a sweat. So why is it still not for sale?
The way beliefs spread from one person to another resembles, in some ways, the way a virus spreads. A modern theory of idea epidemiology casts new light on religions, fads, political movements, and more.
The Theory of Relativity says that nothing can accelerate to a speed faster than light. But a hypothetical particle called a tachyon gets around this rule because it started out going faster than light.