Publication of a Harvard committee report on irreversible coma establishes a paradigm for defining brain death.[8][9] France becomes the first European country to adopt brain death as a legal definition (or indicator) of death.
, a theoretical model to explain biped locomotion.
Space exploration
September 15–22 – Zond program: Soviet spacecraft Zond 5 becomes the first vehicle to circle the Moon (September 18) and return to splashdown on Earth. It also carries the first living organisms to circle the Moon, including two Russian tortoises, Piophila, mealworms, plants and bacteria.
October 11 –
R. Walter Cunningham aboard. Goals for the mission include the first live television broadcast from orbit and testing the lunar module
docking maneuver.
December 24 –
far side of the Moon and planet Earth as a whole. Anders photographs Earthrise
^DiGeorge, A. M. (1968), Congenital absence of the thymus and its immunologic consequences: concurrence with congenital hypoparathyroidism, vol. IV, White Plains, NY: March of Dimes-Birth Defects Foundation, pp. 116–21