July 18 is the 199th day of the year (200th in leap years) in the Gregorian calendar; 166 days remain until the end of the year.

On April 20, 2021, Ma'Khia Bryant, a 16-year-old African-American girl, was fatally shot by Columbus police officer Nicholas Reardon while Bryant was attempting to stab two women in southeast Columbus, Ohio. The officers applied medical treatment and Bryant was transported to a local hospital, where she was pronounced dead half an hour later. The incident is under investigation.

Pyotr Leonidovich Kapitsa or Peter Kapitza (Russian: Пётр Леонидович Капица, Romanian: Petre Capița (8 July [O.S. 26 June] 1894 – 8 April 1984) was a leading Soviet physicist, engineer and Nobel laureate, best known for his work in low-temperature physics.