DARK MATTER

A group of physicists says that it is still detecting the presence of dark matter — the mystery substance thought to make up 85% of matter in the Universe — 20 years after it saw the first hints of such a signal. DAMA, a collaboration of Italian and Chinese researchers, has...

IF YOU WANT to build and run a $70 million dark matter detector, you’re going to have a hefty shopping list. You’ll need to buy hundreds of photomultiplier tubes, set up elaborate electronics, and pay graduate students, for starters. And 20 percent of your cash is going to go to...