Dr Karl: Need to Know
How Aussie scientists used cane toads to confirm pregnancies
Cane toads are one of Australia’s most notorious pests, but back in the day Australian scientists found ways to make them useful.
Category: Dr Karl: Need to Know
Dr Karl: Need to Know
Earth’s mega mountains
Earth’s biggest mountain range is one very few of us will ever see.
Dr Karl: Need to Know
What would happen if our planet stopped spinning entirely?
This is what the world would look like if earth stopped spinning.
Dr Karl: Need to Know
The science behind the tides
There are about 120 different possible tides each day. There are tides that happen once a day, twice a day, three times a day, four times a day, and so on.
Dr Karl: Need to Know
Popular sunscreen chemical can kill baby corals
Consider wearing zinc or covering up next time you’re snorkeling, says Dr Karl – one popular sunscreen chemical can be toxic for baby corals.
Dr Karl: Need to Know
Could cows produce strawberry-flavoured milk?
We do know cows’ diets affects the flavour of their milk.
Dr Karl: Need to Know
Dr Karl: The truth about Uluru
The phrase ‘world’s largest monolith’ makes a nice story for tourists visiting Australia’s iconic Uluru. Just don’t say it near a geologist.
Dr Karl: Need to Know
Why does your dog wag its tail?
Dr Karl uncovers the curious hidden meanings behind your dog’s tail wagging.
Dr Karl: Need to Know
Killer heat waves
Dr Karl investigates the growing global trend of heat waves, which have killed more Australians than all other natural disasters combined.
Dr Karl: Need to Know
The thorny devil lizard’s drinking habits
How the thorny devil takes “flat out like a lizard drinking” to the extreme.