Life & nature
Plants, bodies, germs and the story of life on Earth. 36 ready to play, 32 coming soon.
How caffeine works
Watch a sleepy signal get blocked, then see why the tiredness comes back later.
How vaccines work
Show your immune system a wanted poster before the real villain arrives.
How the dinosaurs died
Drop the asteroid and follow the dust that dimmed the whole planet.
What causes hiccups
Poke the diaphragm and hear the snap that makes the 'hic'.
How coral reefs form
Meet the tiny animals that build the biggest structures on Earth.
How birds migrate
Fly south with the flock and find your way with the Sun and stars.
How dogs see the world
Switch to dog vision: fewer colours, a better nose for motion.
How cats purr
Twitch the voice box 25 times a second and feel the rumble.
What causes a heart attack
Follow the blood to the heart muscle and see what blocks the way.
How fish breathe underwater
Push water over feathery gills and pull the oxygen out.
Why sleep is important
Follow your brain through a night and see what it fixes while you rest.
How enzymes work
Fit the right molecule into the pocket and snap a reaction a million times faster.
How humans evolved
Walk the family tree from ancient footprints to us.
What causes diabetes
Run out of insulin keys and watch sugar pile up in the blood.
What causes asthma
Squeeze and swell the airways and feel how hard breathing gets.
What causes cavities
Feed sugar to mouth bacteria and watch acid dig into a tooth.
How antibiotics work
Break a bacterium's wall and leave your own cells alone.
How bacteria reproduce
Split one cell in two, then four, then a million by lunchtime.
Why DNA matters
Unzip the instruction book inside every one of your cells.
Why we sneeze
Tickle a nose and launch a 100-mile-an-hour achoo (maybe).
Why homeostasis is important
Keep a body at 37 °C through heatwaves and snowstorms.
What causes goosebumps
Flex hundreds of tiny muscles you never knew you had.
Why wolves howl
Send a message across miles of forest with one long note.
What causes kidney stones
Watch tiny crystals grow into a pebble, and see how water stops them.
Why cats sleep so much
Nap like a hunter built for short, fast bursts.
What causes brain freeze
Chill the roof of your mouth and trick your brain.
Why viruses aren't considered living
Meet a tiny hijacker that can't copy itself on its own.
Why hair turns gray
Watch pigment cells slowly run out of colour.
How horses sleep
Lock your legs and doze standing up.
How snakes move
Slither without legs using four clever tricks.
How starfish regrow their arms
Lose an arm, grow it back.
Where yeast comes from
Meet the tiny fungus that makes bread rise.
Why veins look blue
Discover why red blood looks blue through your skin.
What makes a fruit a fruit
Is a tomato a fruit? Follow the seeds to find out.
Why sleep paralysis happens
Find out why your brain can wake up before your body.
How photosynthesis works
Shrink down into a leaf and watch sunlight turn into sugar.