Albert Einstein (14.03.1879 – 18.04.1955)
In 1915, Albert Einstein published his Theory of General Relativity, which holds that space and time are not separate, but that instead, just like the spatial dimensions, time is also nothing but a dimension of the unified space-time continuum. Among many other things, General Relativity also holds that matter — i.e. anything with mass — causes the fabric of space-time to curve around it, and that this is what causes the phenomenon we call gravity, i.e. objects fall toward each other because of the curvature of space-time.
Because matter warps the fabric of space-time, General Relativity also predicts that the motion of matter through space-time — e.g. the rotation of stars, planets and moons — will cause ripples to occur in the fabric of space-time. This effect is called frame-dragging.
These ripples are called gravitational waves, but although just about everything else predicted by Einstein's Theory of General Relativity had already been confirmed, the gravitational waves themselves had still not been detected directly yet. Or at least, not up until now, that is. Enter the LIGO ("Laser Interferometer Gravitational Wave Observatory").
Today, on the 11th of February 2016, the LIGO has announced that they have directly detected gravitational waves, thereby proving Albert Einstein right once again, now a whole century after the publication of his Theory of General Relativity.
You can find the official statement from the US National Science Foundation here. I reckon that if good old Albert were still alive today, he'd be making a face like this now...