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In the season premiere, Elmo gets upset when Rosita’s beach ball knocks over his block tower.

Schulz introduced him by having Franklin return Charlie Brown’s wayward beach ball one day by the sea.

He said they ranged in size from "maybe the size of a dinner plate to maybe a beach ball - there were really some good-sized ones".

“Imagine a beach ball filled with fluid in your stomach all the time,” said Dr. Joseph Cleveland, Jr., a cardiothoracic surgeon at the University of Colorado School of Medicine.

The scientists wanted to know if, in the instant after collision, the swirling momentum of the quark-gluon soup could cause phi mesons to spin along with it, like a beach ball in a whirlpool.