Even the Voyager spacecraft are controlled remotely, 20 billion kilometres away. It takes 20 hours for instructions to travel from Earth to the spacecraft but we can do it – using a remote.
The energy needed to pull magnets apart comes from you, and you get it from the food you eat. And the plants or animals you eat get their energy from other plants and animals, or from the Sun. All energy comes from somewhere.
There are probably more than a million planets in the universe for every single grain of sand on Earth. That’s a lot of planets. My guess is that there probably is life elsewhere in the Universe.
The parts of the brain that get ‘smell signals’ from the nose also do other things, such as storing memories or provoking emotions. That is why some smells can bring back old memories.
Every human carries an instruction booklet with a very special code, called DNA. Our eyes cannot read the code, but our bodies can. The code tells our body what to do and how to look.
Brad Carter, University of Southern Queensland and Jake Clark, University of Southern Queensland
There are lots of places where it’s much, much hotter than the Sun. And the amazing thing is that this heat also makes new atoms - tiny particles that have made their way long ago from stars to us.
Like reptiles, birds do not have two separate exits from the body. They have one, called the cloaca. It is quite similar to the human anus but the cloaca expels both indigestible bits and toxins.
Just like a mobile phone, your body needs to be recharged every day. You need to eat food and drink water every day to keep your body going. Some foods are better than others at helping you stay well.
Sunanda Creagh, The Conversation and Molly Glassey, The Conversation
These school holidays, check out the podcast Imagine This, a co-production between ABC KIDS listen and The Conversation. And comb through our Curious Kids series.
Your field of view is how much you can see without turning your head. When things are closer to us, they take up more of our field of view, which makes them look bigger.