Only one side of the bubble wrap bubbles due to the way it’s made: the second sheet is bubble-less because it’s flat to seal the bubbles of the first sheet in place.

Twin shock waves produced by the galaxy's central black hole could have inflated the gargantuan Fermi Bubbles about 6 million years ago, a new study suggests.

“These are the same bubbles that preserve ancient air studied in ice cores,” said co-author Erin Pettit, glaciologist and professor in the OSU College of Earth, Ocean, and Atmospheric Sciences.