Meer
8 cards from across every topic, each citing a source. Tap one to open it in the feed.
- A jellyfish can turn itself back into a juvenile.
Turritopsis dohrnii is only about 4.5 millimetres across. When injured, starving or old, it rebuilds its cells and …
- A shark older than the United States.
Greenland sharks live in the cold North Atlantic and grow less than a centimeter per year. In 2016, researchers …
- An octopus has three hearts and blue blood.
Two hearts push blood through the gills; the third supplies the body. That body heart stops while the animal swims …
- High tide happens on the side facing away from the Moon too.
The Moon pulls the near-side water more strongly than Earth's centre, and the centre more strongly than the far-side …
- The internet lies on the seafloor, not in space.
The vast majority of intercontinental data traffic runs through fiber-optic cables on the ocean floor, not via …
- The largest animal that ever lived is alive today.
Blue whales reach nearly 30 meters and up to around 190 tonnes, heavier than any known dinosaur. A blue whale heart …
- The strongest known biological material is snail teeth.
Limpets rasp algae off rock, and their tiny teeth take it: in 2015 researchers measured tensile strengths of 3.0 to 6.5 …
- This shrimp punches faster than you can blink.
Mantis shrimp fling their clubs forward at over 80 km/h, cracking snail shells and, rarely, even aquarium glass. The …