Fall brings football season in the U.S. and, with it, the parade of distinctively decorated helmets that the players wear[1].

Over time, the shape and size of these helmets have gradually changed, from the leather head coverings[2] of the early 20th century to the space-age plastic domes[3] we’re accustomed to seeing today.

But the visual profiles of some NFL football helmets may change drastically in 2024. The league has...

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The Centers for Disease Control and Prevention first used the term “AIDS[1]” on Sept. 24, 1982, more than a year after the first cases appeared in medical records. Those early years of the crisis were marked by a great deal of confusion over what caused the disease, who it affected and how it spread.

But the naming itself – acquired immunodeficiency syndrome, which we now know is caused by the human immunodeficiency...

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