Can animals be allergic to humans? Why do people always go on holidays near water? Why do I sleep talk?
Why do some people work harder at the gym when they listen to a favourite tune? Plus: why does your stomach rumble when you are hungry? And why do your hands tingle after an orgasm?
Dr Karl is away for the month, so science journalist Bianca Nogrady is stepping in to be your science sherpa on triple j. And joining her today was Dr Jess Bloom, astrophysicist from the University of Sydney.
Is a Googleplex the biggest single number? Are rising sea levels only caused by ice melting? Why do we get blocked noses?