by Jean-Louis SANTINI WASHINGTON, United States (AFP) — A team of international scientists said Wednesday that they had detected gravitational waves — ripples in space and time, which Albert Einstein predicted a century ago — for the second time. Einstein predicted the existence of the waves in his theory of relativity a century ago, and scientists have been able to detect them with an instrument known as the Laser Interferometer Gravitational-Wave Observatory, or LIGO. The […]