One of the most popular theories about why we greet each other with a handshake explains that it's a way of showing that we're unarmed, as a sign of peace. But another theory suggests a supposed biological origin, to detect the chemical signals of…

It took 15 years of data collection and the creation of a virtual laboratory almost the size of our galaxy, but scientists have, for the first time, managed to hear the perpetual chorus of gravitational waves that permeates the entire universe.

A planet within a planet. That would be a good way to describe the 2,442 km diameter ball of solid metal at the center of the Earth, without which, incidentally, there would be no magnetic field and no life on the surface. But how do we…

On October 17, 1934, Santiago Ramón y Cajal, one of the most brilliant Spanish (and world) scientists in history, the father of modern neuroscience, and a Nobel Prize winner, died in Madrid. Before that day, he had written in his will that…