Rather than breathing in and out through the mouth, fish use a one-way system, passing water in one direction over their gills.
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Grammar isn’t a way to bully people for making mistakes, says a longtime English instructor. It is a way to understand how our language operates, in all its many written and spoken varieties.
It’s all to do with the light from the Sun and a blanket of air wrapped around Earth called the ‘atmosphere’.
Technology can give superhero abilities to people in real life.
Different animals have different ways of showing they’re happy. Their behaviours aren’t as straightforward as you might think.
The mystery of how the brain creates consciousness still puzzles scientists, but the mechanics of waking up are starting to be understood.
There are 15 different kinds of electrical outlets around the world. One standard would be more convenient, but no one wants to change theirs.
All the fluids in our bodies have a little bit of salt in them.
Mermaids are not real, but are meaningful to people around the world.
Lots of viruses have disappeared before. But experts think COVID will stay with us for a long time to come.
The Earth spins around its axis every day – but gravity keeps us firmly in place.
66 million years ago, birds survived the calamity that wiped out all prehistoric dinosaurs. But could birds once again evolve into their long lost ancestors?
How do tigers – a top predator – successfully hunt their prey when they have bright orange fur? The secret’s in their stripes!
Geese honk loudly and point their bills toward the sky when they’re ready to start the migration. Here’s how they know it’s time, how they navigate and how they conserve energy on the grueling trip.
It’s not just older adults who get shorter. You start shrinking, the moment you get out of bed in the morning.
Pink blood, green blood, or no blood at all – when it comes to what’s inside a worm’s body, the answer is more complicated – and fascinating – than you’d think.
To concentrate best, we need to resist distractions. It can help to set some goals and check your progress as you study.
Today’s birds evolved from feathered dinosaurs.
Vaccines work by teaching your immune system about new viruses. Your immune cells are very clever – they will remember what they learnt, and protect you if you encounter that virus in the future.
Volcanoes give lots of clues which help scientists work out if they are about to erupt.
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