Template:Are You Sure/December 28

• ... that Francesco Maria Grimaldi was the first to make accurate observations on the diffraction of light (although by some accounts Leonardo da Vinci had earlier noted it), and coined the word 'diffraction'?

• ... that John von Neumann's last work, an unfinished manuscript written while in the hospital, was later published in book form as The Computer and the Brain?

• ... that the carnivorous dirigible (Dirigible horribilis) is a grazing ruminant airship, neither carnivorous nor horrible?