From a telescope network that spans much of the globe to a psychology study that spans 67 countries, here are the biggest ...

In 1942, Sigmund Rascher and others conducted high-altitude experiments on prisoners at Dachau. Eager to find out how best to save German pilots forced to eject at high altitude, they placed ...

The spring constant of a spring can be found by carrying out an experiment. The unloaded length of a spring is measured. Slotted masses are added to the spring. Record each stretching force in N ...

and how we might actually find it. From deep underground caverns to laboratories in space, here are five of the coolest dark matter experiments that are attempting to solve this cosmic mystery.