I've searched for the on-going one but by the look of things they've all been locked. So with that in mind, here's a bunch to kick things off - 1. The Curiosity rover on Mars sings ‘Happy Birthday’ to itself every year. Probably the loneliest birthday in the solar system. 2. There is a whale called 52 Blue that only sings at their frequency meaning it can’t communicate with other whales. It is nicknamed the loneliest whale on the planet. 3. 40% of the food produced in the world goes to waste. 4. The outside of your eye prevents your immune system from ever knowing about the inside of your eye. If a puncture allows the two to meet, your immune system may attack and destroy your eye as an invader. Terms for the horrified who cling to their skepticism as a shield against acknowledging this unfun fact to google: “immune privilege of the eye” So y'know... that's fun.