Ferns came along more than 200 million years before the dinosaurs walked the Earth. They were food for plant-eating dinosaurs and they're really great survivors. Heather, age 8, wants to know more.
Volcanologists study the formation and eruptions of volcanoes - surely one of the most interesting jobs around. However, it can also be very dangerous.
Whether we're happy or sad, it doesn't take much to turn on the waterworks. But how and why do humans cry?
The short answer is no. But worms can use different parts of their body to do some of the jobs that our tongues do - like tasting and crushing food.
Maeve, age 8, has a question that has stumped many scientists over the years. And that’s because it’s a surprisingly tricky question to answer. It depends a bit on what you mean by 'person'.
Animals that evolved in cold parts of the world usually have lighter skin. If a light-skinned animal has blood vessels close to the surface of their ear skin, this will make the ears look pink.
The students of class 3E, Ferny Grove State School, want to know if astronauts get space sick when travelling to the International Space Station.
We've all seen videos of satellites being blasted off into space - but once they're locked in orbit around the earth, how do we bring them back down?
Younus, age 9, wants to know how people become allergic to food.
When humans are happy, they may smile, or laugh, or dance - but what do animals do? Melissa, age 12, wants to know how she can tell if her cat is happy and likes you.
Imagine the Earth pulling everything it is made up of, all of its mass, towards its centre. This happens evenly all over the Earth, causing it to take on a round shape.
If one venomous snake bites a mouse and injects venom into it, you can then feed that same dead mouse to another snake. The second snake won't die.
Ada, 7, wants to know why things close to the train windows zoom by really fast, while things further away seem to go by much slower.
Bees sting other animals, including humans, when they think there might be a threat to their hive. But Evie, age 8, wonders if bees ever accidentally sting other bees.
Niamh, age 7, wants to know why we have scary dreams. But after 200 years of study, dreams are still very much a mystery.
How exactly do the stars twinkle in the night sky? As it turns out, the answer is full of hot air... and cold air.
Georgina, age 5, wants to know why rainbows are round.
Breathing in through your nose has many medical benefits over mouth breathing. As usual, be wary of misinformation and bias when looking up health on the internet.
You flush the toilet. Down it goes. What happens after that? Clancy, age four, wants to know.
Why are there 60 minutes in an hour, and not 10? Why do we count up to 10, anyway? Quentin, age five, wants to know.