- The Hertzsprung–Russell diagram (abbreviated as H–R diagram, HR diagram or HRD) is a scatter plot of stars showing the relationship between the stars’ absolute magnitudes or luminosities and their stellar classifications or effective temperatures. The diagram was created independently in 1911 by Ejnar Hertzsprung and by Henry Norris Russell in 1913, and represented a major step towards an understanding of stellar evolution.
- Donkey Kong (1981 video game) (Wikipedia)
Donkey Kong is a 1981 arcade video game developed and published by Nintendo. As Mario (also sometimes known at the time as “Jumpman”), the player runs and jumps on platforms and climbs ladders to ascend a construction site and rescue Pauline from a giant gorilla, Donkey Kong. It is the first game in the Donkey Kong series and Mario’s first appearance in a video game.
