Every day: a new round with 1 short video and 4 comic strips. Every fact is checked, with sources.
Real fact: The shark family goes back further than trees. Shark-like scales show up in rocks about 450 million years old, while the first trees grew about 385–390 million years ago. (Early sharks looked different from today's sharks, but still!)
Real fact: One spin of Venus takes about 243 Earth days, but one trip around the Sun takes only about 225. So a day on Venus is longer than its year!
Real fact: Octopuses have three hearts: two pump blood through the gills and one pumps it to the rest of the body. Their blood is blue because it carries oxygen with a copper-based protein called hemocyanin.
Real fact: While you sleep lying down, the squishy discs between your spine bones soak up fluid. That makes most people about half a centimeter to a centimeter taller in the morning. Gravity squishes them back down during the day.
Real fact: On September 9, 1947, engineers testing the Harvard Mark II computer found a moth stuck in a relay. They taped it into their logbook as the “first actual case of bug being found.” That logbook is now at the Smithsonian.