The sand dunes we can't get on Earth
Some of the wind-sculpted sand ripples on Mars and their relationship to the thin Martian atmosphere have provided new clues about its history. Six months ago, Nasa's Curiosity Mars rover made the first up-close study of active sand dunes at the Bagnold Dunes on Mars' Mount Sharp. The researchers concluded that the metre-scale ripples are made by Martian wind dragging sand the same way water drags sand particles on Earth.
What pigs can tell us with grunts
We might think it only the language of middle-aged, couch-bound human males, but grunts are also a complex form of communication between pigs. UK researchers have found pigs' grunts vary depending on their personality and can convey information about their welfare. Pigs with more proactive personality types produced grunts at a higher rate, while male pigs kept in lower-quality conditions made fewer grunts compared with those housed in more comfortable environments.
How humans are creating new species