- Messier 53 (also known as M53 or NGC 5024) is a globular cluster in the Coma Berenices constellation. It was discovered by Johann Elert Bode in 1775. M53 is one of the more outlying globular clusters, being about 60,000 light-years (18.4 kpc) light-years away from the Galactic Center, and almost the same distance (about 58,000 light-years (17.9 kpc)) from the Solar System. The cluster has a core radius (rc) of 2.18 pc, a half-light radius (rh) of 5.84 pc, and a tidal radius (rtr) of 239.9 pc.
- 3D Tic-Tac-Toe (Wikipedia)
Atari released a 4x4x4 graphical version of the game for the Atari 2600 console and Atari 8-bit computers in 1978. The program was written by Carol Shaw, who went on to greater fame as the creator of Activision’s River Raid. It uses the standard joystick controller. It can be played by two players against each other, or one player can play against the program on one of eight different difficulty settings. The product code for the Atari game was CX-2618.