Mykola Kobzar on Instagram: "At the ends of vour chromosomes are protective caps called telomeres. They're like the tips of shoelaces--thev prevent DNA from fraying. Every time a cell divides, telomeres get shorter. When thev're too short, the cell dies. These are the biological clocks of aging And scientists discovered something shocking stress speeds up this clock dramatically. But one inner state can trigger the reverse process. 5 facts that will change how you see stress: 1. Elizabeth Blackb

Space Eve on Instagram: "In December 1972 Apollo 17’s Lunar Module Challenger touched down in Taurus–Littrow. Here Gene Cernan steps off the ladder first, followed by Harrison “Jack” Schmitt, starting the last Apollo moonwalks and the most geology-focused mission of the program. Follow @spaceeves #Apollo17 #MoonLanding #SpaceHistory"