Are there any undiscovered animals? / Sir David Attenborough
Is it OK to eat a worm? / Bear Grylls
What are atoms? / Marcus Chown
Why are the grown-ups in charge? / Miranda Hart
Why is blood red, not blue? / Dr. Christian Jessen
How are dreams made? / Alain de Botton
How long would it take to walk around the world? / Rosie Swale-Pope
Why do we have music? / Jarvis Cocker
Do aliens exist? / Dr Seth Shostak
Where does wind come from? / Antony Woodward and Rob Penn
Why do we speak English? / Professor David Crystal
Why did dinosaurs go extinct and not other animals? / Dr Richard Fortey
Why do cakes taste so nice? / Lorraine Pascale
How do plants and trees grow from a small seed? / Alys Fowler
Why do monkeys like bananas? / Daniel Simmonds
Is the human brain the most powerful thing on earth? / Derrn Brown
What is global warming? / Dr Maggie Aderin-Pocock
Why do I get hiccups? / Harry Hill
Why is space so sparkly? / Martin Rees
Why can't animals talk like us? / Noam Chomsky
How do story writers get ideas for characters? / Dame Jacqueline Wilson
How do cars work? / David Rooney
Why can't I tickle myself? / David Eagleman
Who had the first pet? / Celia Haddon
Why are planets round? / Professor Chris Riley
Can a bee sting a bee? / Dr George McGavin
How do you keep going when you're losing in sport? / Dame Kelly Holmes
Why do wars happen? / Alex Crawford
Why do we go to the toilet? / Adam Hart-Davis
Why do lions roar? / Kate Humble
Why do we have money? / Robert Preston
Who wrote the first book ever? / Professor Martyn Lyons
Why do elephants have trunks? / Michaela Strachan
Why are some people mean? / Dr Oliver James
How do trees make the air we breathe? / Dr. David Bellamy
If the universe started from nothing, how did it become something? / Dr Simon Singh
Why do people have different-coloured skin? / Carl Zimmer
Will the north and south poles ever melt completelly? / Dr Gabrielle Walker
Where does 'good' come from? / A.C. Grayling
Why is the sun so hot? / Dr Lucie Green
What is the most endangered animal in the world? / Mark Cowardine
Who do girls have babies and boys don't / Dr Sarah Jarvis
In Victorian times why did kids do all the work? / Claire Tomalin
What is gravity, and why isn't there any in space? / Dr Nicholas J.M. Patrick
Why can't we live forever? / Richard Holloway
How does water get into the clouds so it can rain? / Gavin Pretor-Pinney
Who do animals that fly have feathers, no including bats? / John 'Jack' Horner
How does my brain control me? / Baroness Susan Greenfield
How do chefs get ideas for recipes? / Gordon Ramsay
Are we all related? / Dr Richard Dawkins
How do they know all snowflakes are different? / Justin POllard
Why does time go slowly when you want it to go fast? / Claudia Hammond
Who first made metal things? / Neil Oliver
How do the bubbles get into fizzy drinks? / Steve Mould
Why is the sky blue? / Simon Inge
How do sportspeople concentrate when the crowd is noisy? / Colin Montgomerie
Do monkeys and chickens have anything in common? / Dr Yan Wong
How did we first learn to write? / John Man
Why do scientists look at germs, and why can't I see them? / Joanne Manaster
Do any people eat polar bears or lions? / Benedict Allen
Why does the moon change shape? / Professor Chris Riley
Do numbers go forever? / Marcus du Sautoy
Where did the first seed come from? / Dr Karen James
Why was Guy Fawkes so naughty? / Philippa Gregory
What do you have to do to get into the Olympic games? / Jessica Ennis
Who was the first artist? / Michael Wood
What am I made of? / Professor Lawrence Krauss
Why do penguins live at the South Pole but not the North? / Vanessa Berlowitz
How does an aeroplane fly? / David Rooney
What's the strongest animal? / Mark Forsyth
Why is water wet? / Roger Highfield
What would I look like if I didn't have a skeleton? / Professor Joy S. Gaylinn Reidenberg
Are cows polluting the air? / Tim Smit
How do writers think of their ideas? / Philip Pullman
Who invented chocolate? / Joanne Harris
Why do men grow beards and not women? / Dr Christian JEssen
Is sugar bad for you? / Annabel Karmel
How did they pyramids in Egypt? / Dr Joyce Tyldesley
Why is the sky dark at night? / Christopher Potter
What should you do when you can't think of what to draw or paint? / Tracey Emin
How do you make electricity? / Professor Jim Al-Khalili
Did Alexander the Great like frogs? / Bettany Hughes
What are our bones made of? / Professor Alice Roberts
If you're on a boat with no food or water, what do you do? / Roz Savage
How does my cat always find her way home? / Dr Rupert Sheldrake
What's inside the world? / Professor Iain Stewart
Who is God? / Julian Baggini, Meg Rossoff, Francis Spufford
How many different types of beetle are there in the whole world? / Dr George McGavin
How far away is space? / Marcus Chown
How does lightening happen? / Professor Kathy Sykea
Why are some people taller than others? / Katie Woodard
Why is wee yellow? / Sally Magnusson
What was the biggest battle the Romans fought in? / Gary Smailes
Why do I get bored? / Professor Peter Toohey
Are there really monsters living in our mouths called blackteria? / Liz Bonnin
Why do we sleep at night? / Professor Russell G. Foster
Will we ever be able to go back in time? / Dr John Gribbin
How does fire get on fire? / Dr Bunhead
Why do we have lots of countries, not just one big country? / Dan Snow
What makes me me? / Professor Chris Stringer, Professor Gary Marcus, Michael Rosen
If a cow didn't fart for a whole year and then did one big fart, would it fly into space? / Mary Roach
Why is the sea salty? / Mark Kurlansky
What is the internet for? / Clay Shirky
How did Michelangelo get so famous? / Sister Wendy Beckett
How do you fall in love? / Jeanette Winterson, David Nicholls, Professor Robin Dunbar
If my stomach was unravelled how long would it be? / Dr Michael Mosley
Why do we have an alphabet? / John Man
Who do I always fight with my brother and sister? / Professor Tanya Byron
What are rainbows made of? / Antony Woodward and Rob Penn
When did people start using recipes? / Mario Batali
Why does the moon shine? / Dr Heather Couper
Where do the oceans come from? / Dr Gabrielle Walker?
Why do snails have shells bu slugs don't? / Nick Baker
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