Nature
Short articles about nature, one idea in each.
- Tardigrades survived ten days in open spaceIn 2007, dried-out tardigrades rode on the outside of a spacecraft, exposed to vacuum and the Sun's raw ultraviolet light. Some of them came back to life.
- An octopus has three hearts and blue bloodTwo hearts pump blood through the gills, a third sends it round the body, and the blood carries oxygen on copper instead of iron. Here is how the pieces fit.
- A tree is built mostly from airA large tree weighs tonnes, yet it doesn't leave a hole in the ground. Most of its mass came in through the leaves, as carbon dioxide.