Series 16

The Space Burrito

Is there a point in space where the Sun could heat a burrito perfectly? And other puzzles.

• 34 mins

Series 17

The Hamster Power Hypothesis

How many hamsters on wheels would it take to power London?

• 38 mins

Series 17

The Martian Mission

What would it take for humans to live on Mars? Drs Rutherford and Fry investigate.

• 42 mins

Series 17

The Good and Bad in Fungi

"Why are some fungi helpful and others harmful?" asks Paul Glaister in Reading.

• 48 mins

Series 17

The Pizza Diet

Can I make a pizza that contains my recommended daily intake of everything? asks Paul

• 42 mins

Series 17

The Noises That Make Us Cringe

Why do some people find noises like a fork scraping a plate so terrible?

• 48 mins

Series 17

The Scientific Exploration of Astrology

Could there be something to astrology? asks Dan in Australia

• 50 mins

Series 17

The Mosquito Conundrum

What’s the point of mosquitoes? asks Cathy

• 45 mins

Series 17

The Flying Clock and the Stopped Watch

Do individuals perceive time differently? asks Joe from North Yorkshire

• 50 mins

Series 17

A Weighty Matter Part 1

How does gravity pull us? asks Emma

• 43 mins

Series 17

A Weighty Matter Part 2/2

Is dark matter a fudge to fit existing theories to inexplicable observations?

• 40 mins

Series 17

Back to The Sinister Hand

What determines left or right handedness? asks Neal Shepperson

• 29 mins

Series 17

More Frytful Scares

Why do people like to be scared?

• 29 mins

Series 18

The Guiding Hound

How do guide dogs know where they're going?

• 39 mins

Series 18

The Weirdness of Water Part 1/2

Please explain the weirdness of water? Drs Rutherford and Fry investigate.

• 37 mins

Series 18

The Weirdness of Water Part 2/2

Adam Rutherford and Hannah Fry attempt to answer more questions on why water is weird

• 40 mins

Series 18

The Painless Heart

Why does my heart not ache after exercise? Drs Rutherford and Fry investigate

• 37 mins

Series 18

The Slippery Situation

'What is the most slippy thing in the world?' asks 8 year old Evelyn from London

• 37 mins

Series 18

The Venomous Vendetta

Will a venomous snake die if it bites itself? asks Janni in Amsterdam

• 42 mins

Series 19

The Mystery of the Teenage Brain

Why do my teens struggle to get out of bed in the morning? asks Michelle.

• 33 mins

Series 19

The Weird Waves of Wi-Fi

“How does Wi-Fi work - is it magic?” asks Abby

• 34 mins

Series 19

Surprising Symmetries

We’ve got two eyes, two arms, two legs - but only one heart. Why!? asks Joanne.

• 33 mins

Series 19

The Shocking White Hair

Can human hair turn white overnight from shock? Hannah and Adam investigate greying hair.

• 34 mins

Series 19

The Turn of the Tide

Why are tide times and ranges so different around the UK, asks Lynn?

• 34 mins

Series 19

The Colour Conundrum

'How do we see colour - and why are some people colour blind?’ asks Maya Crocombe.

• 35 mins

Series 20

The Case of The Missing Gorilla

'How can I be immersed in a book, and still notice my name?' asks Charlotte.

• 37 mins

Series 20

The Wild and Windy Tale

“How do winds start and why do they stop?” asks Georgina from the Isle of Wight

• 38 mins

Series 20

The Suspicious Smell

Why do our bodies smell? And does our smell influence how much we like each other?

• 38 mins

Series 20

The Problem of Infinite Pi(e)

'How did we discover pi? How do we know that it’s infinite and never repeats?' asks Alex.

• 35 mins

Series 20

The Riddle of Red-Eyes and Runny-Noses

“Are allergies really on the increase?” wonders Ally

• 36 mins