Answers on the Web vary from a few thousand meters to 48 kilometers. Now a pair of physicists have carried out an experiment to find out.
The fourth in a series of international reports, due out tomorrow, reflects better science and more-precise models.
The community that built the largest encyclopedia in history is shrinking, even as more people and Internet services depend on it than ever. Can it be revived, or is this the end of the Web’s idealistic era?
FireChat can link Android and Apple phones into a long-range communications network even when the cell network is down.
Supercharge your immune cells to defeat cancer? Juno Therapeutics believes its treatments can do exactly that.
We put Yahoo Answers, Amazon’s Askville, and rival question-and-answer services to the test.
Vision algorithms are now good enough to let a car drive automatically with just one camera.
In a country of rigid teaching styles and scarce university slots, students and professors are exploring what online learning can be.
The world’s best-known consciousness researcher says machines could one day become self-aware.