A new analysis of an extinct giant kangaroo skull suggests it was adapted to eat tough, woody material - a feeding style not found in any modern marsupials.
Rabies is almost always fatal once the symptoms appear. It is also completely preventable, so long as you know how to protect yourself.
Until recently we didn't know much about which antibiotic is best for people who have been attacked by a crocodile.
New initiative with old handsets halves rates of the disease in southern Tanzania – and is being applied to other conditions, too.