It's been a long year.
1. Gravitational waves are real. More than 100 years after Einstein first predicted them, researchers finally detected the elusive ripples in space time this year. We've now seen three gravitational wave events in total.
2. Sloths almost die every time they poop, and it looks agonising.
3. It's possible to live for more than a year without a heart in your body.
4. It's also possible to live a normal life without 90 percent of your brain.
5. There are strange, metallic sounds coming from the Mariana trench, the deepest point on Earth's surface. Scientists currently think the noise is a new kind of baleen whale call.
6. A revolutionary new type of nuclear fusion machine being trialled in Germany really works, and could be the key to clean, unlimited energy.
7. There's an Earth-like planet just 4.2 light-years away in the Alpha Centauri star system - and scientists are already planning a mission to visit it.
8. Earth has a second mini-moon orbiting it, known as a 'quasi-satellite'. It's called 2016 HO3.
9. There might be a ninth planet in our Solar System (no, Pluto doesn't count).
10. The first written record demonstrating the laws of friction has been hiding inside Leonardo da Vinci's "irrelevant scribbles" for the past 500 years.
11. Zika virus can be spread sexually, and it really does cause microcephaly in babies.
12. Crows have big ears, and they're kinda terrifying.
13. The largest known prime number is 274,207,281– 1, which is a ridiculous 22 million digits in length. It's 5 million digits longer than the second largest prime.
14. The North Pole is slowly moving towards London, due to the planet's shifting water content.
15. Earth lost enough sea ice this year to cover the entire land mass of India.
16. Artificial intelligence can beat humans at Go.
17. Tardigrades are so indestructible because they have an in-built toolkit to protect their DNA from damage. These tiny creatures can survive being frozen for decades, can bounce back from total desiccation, and can even handle the harsh radiation of space.
18. There are two liquid states of water.
19. Pear-shaped atomic nuclei exist, and they make time travel seem pretty damn impossible.
20. Dinosaurs had glorious tail feathers, and they were floppy.
21. One third of the planet can no longer see the Milky Way from where they live.
22. There's a giant, 1.5-billion-cubic-metre (54-billion-cubic-foot) field of precious helium gas in Tanzania.
23. The 'impossible' EM Drive is the propulsion system that just won't quit. NASA says it really does seem to produce thrust - but they still have no idea how. We'll save that mystery for 2017.
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