In a curious coincidence, two of the most popular presidential candidates share a particular linguistic tic – the inability to say the letter "H" before the letter "U" – a fact that has not gone unnoticed by the media, the candidates, and their supporters.

PBS Spacetime explains today's ground breaking detection of gravity waves, verifying the final major prediction in Einstein's theory of general relativity over 100 years after it was proposed.

This exasperated expression is often used in reaction images and animated GIFs to indicate a sense of emotional exhaustion.

OK Go, the American alt-rock quartet known for producing visually striking and elaborately choreographed music videos, partnered with Russian airliner S7 Airlines to go on a parabolic flight tens of thousands of feet above the ground to create this weightless music video for their latest single "Upside Down & Inside Out."