10 Best Big Bang Theory Running Gags Ranked

From saying Bazinga to singing Soft Kitty to Sheldon's schedule, we ranked "The Big Bang Theory's" running jokes from ...
Space.comOpinion

Most normal matter in the universe isn't found in planets, stars or galaxies – an astronomer explains where it's distributed

But the Big Bang theory predicts that about 5% of the universe's contents should be atoms made of protons, neutrons and ...