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...

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...