A new study looks at the African elephants and how they great each other -  ABC Science Reporter Belinda Smith says it involves lots of vocalisation and noise, and likens it to "family members greeting each other at the airport."

And researchers say Beethoven's hearing loss can be explained, at least partly, by toxic chemicals found in his hair.

BRAINTEASER:

My child, Roman, had a birthday party last week. Four guests were aged 5, nine of them were 6, five were 7 and one was 8. How many 9-year-olds attended?

NOTE: Answer in the audio