Thrilled: huge swarms of bogong moths surprise New South Wales residents and may point to species' recovery. Researcher says sightings of the endangered moth have increased over the last two years but this year has blown them out of the water. Bogong moths are rich in fat and protein, and are an incredibly important food source for critically endangered mountain pygmy possums.

Cleaner air makes kids smarter. A 20 year study of over 1100 children in New York found that their memory and sensory skills improved fastest during the periods when local air pollution fell fastest.