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"Researchers in China say that they've successfully managed to test an engine that runs on electricity, requires no propellant and produces no exhaust. It's called the EmDrive, and it's able to convert microwave energy directly into thrust inside a sealed chamber. Oh, it's totally silent and highly efficient, too. If it seems too good to be true, well, you're not the only one who feels that way. But the researchers have a prototype that apparently works, and they've just published a paper detailing it."

ou like to ask Wikipedia tougher questions than today's simple keyword searches allow? A prototype plug-in that can do just that will be demonstrated at the World Wide Web conference in Lyon, France, next month. Called Swipe - loosely short for "searching Wikipedia by example" - the software aims to let users of the online encyclopedia answer complex questions that most search engines would stumble over. For example, trying to figure out "which actresses won academy awards when they were under 30 years old in the last 25 years?" becomes relatively simple when using the program.

A refrain running through the debate over global warming suggests we need to nothing to slow it, because after all, the climate science predicting more warming could turn out to be wrong. Giordano Bruno was burned at the stake, and Galileo almost was, for objecting to the scientific doctrine that the Sun revolves around the Earth. For two thousand years people believed in systems of physics and astronomy that turned out to be incorrect. And for a few more centuries after that they held to a new celestial mechanics only to see it displaced by relativity theory.