From CERN, April 1: The LHCb experiment at CERN’s Large Hadron Collider has announced the discovery of Eggeron ηgg (eta-gg), familiarly known as the “Humpty Dumpty” particle, the smallest lump of nuclear glue.
April Fool
From The Onion: April 1, 2017: CHICAGO — Two University of Chicago atomic physicists unveiled what they are calling their “most hilarious work to date”: an oversize novelty atom that measures “a ridiculously huge” 8.2 x 10-10 meters in diameter.