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The Broken Stool
How much does the bacteria inside my body weigh?
The World That Turns
'Why does the Earth spin?' asks Joe Wills from Accra in Ghana.
A Code in Blood
Why do we have different blood types? Drs Rutherford and Fry investigate.
The Astronomical Balloon
'How far up can a helium balloon go? Could it go out to space?' asks Juliet Gok, aged 9.
The Forgetful Child
Why don't we remember the first few years of our lives?
The Cat Who Came Back
How do cats find their way back to their old home when they move house?
The Burning Question
What is fire? Is it a solid, liquid or a gas? Adam Rutherford and Hannah Fry investigate.
The Dark Star
The science sleuths investigate the question 'What's inside a black hole?'.
Itchy and Scratchy
Why do we itch and should we scratch?
Kate Bush's Sonic Weapon
Can sound kill? Inspired by a Kate Bush song, we ask whether sonic weapons could work.
The Curious Cake-Off
How to make the perfect sponge using the power of science.
The Polar Opposite
What would happen if the Earth's magnetic poles flipped?
The Sticky Song
Why do tunes get stuck in our heads? And what makes some songs stickier than others?
The Shocking Surprise
Why do we get static shocks? Our science sleuths try to crack another case.
Adventures in Dreamland
Why do we dream? Drs Rutherford and Fry delve into the science of sleep.
The Baffled Bat
How do bats echolocate? And why don't they get confused by neighbouring signals?
The Dreadful Vegetable
Why don't children like vegetables?
The Cosmic Speed Limit
Can anything travel faster than the speed of light? Drs Rutherford and Fry investigate.
The Curious Face Off
Are machines better than humans at identifying faces?
Goldfinger's Moon Laser
Could we shoot a laser to the moon?
The Enigma of Sex, Part 1
Why does sex exist? And why aren't we all the same sex?
The Enigma of Sex, Part 2
Why don't we have more than two sexes?
The Tiniest Dinosaur
Which is the tiniest dinosaur?
The Atomic Blade
What makes things sharp?
The Cosmic Egg
How do we measure the age of the universe?
The Fifth Dimension
Is there a fifth dimension? Hannah and Adam visit CERN to find out.
The Human Instrument
Why do our voices change as we get older?
The Déjà Vu
Why do we get déjà vu?
The Lucky Number
How do I win the lottery?
The Dawn Chorus
Why do birds sing? And why are some songs so complex?
The Alien Enterprise Part 1
How do we look for alien life, and what are we expecting to find?