A urine-specific gravity test compares the density of urine with the density of water. The test may help healthcare professionals identify dehydration, a kidney problem, or a condition like diabetes ...

Tl;dr: Unlikely, but not impossible. Einstein’s theory of general relativity predicts that accelerating masses emit gravitational waves. And last week, a century after this prediction was made, the ...

Gravity has been tested over a shorter distance than ever before. Using a delicate apparatus to measure gravitational forces over just a tenth of a millimetre, a team of physicists has found that they ...