Dr Karl: Need to Know
Dr Karl Kruszelnicki
Dr Karl is a prolific broadcaster, author and Julius Sumner Miller fellow in the School of Physics at the University of Sydney. His latest book, Vital Science is published by Pan MacMillan. Follow him on Twitter at @DoctorKarl
Here, Dr Karl explains the number one problem facing our Great Barrier Reef: coral bleaching caused by climate change.
Cane toads are one of Australia’s most notorious pests, but back in the day Australian scientists found ways to make them useful.
This is what the world would look like if earth stopped spinning.