Scientific sleuths Adam Rutherford and Hannah Fry discover answers to the most perplexing questions emailed in by the audience. Have you got a question? Send it to curiouscases@bbc.co.uk
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6/6 And why does the human voice change as we age?
Rutherford and Fry embark on a never-ending quest for infinite knowledge
4/6 Plus is anything really random?
3/6 Where are we looking for alien life and what are the chances of finding it?
2/6 Plus, how fast can a human run?
1/6 Why do different musical instruments sound unique?
And how do bats differentiate their own echolocation signals?
Plus, how can we measure the age of the Universe?
And are machines better than humans when it comes to recognising faces?
And what makes something sharp?
And why do I get so many static shocks?
Plus, could we make a sonic weapon?
And why do planets spin?
Plus, could a party balloon reach space?
Plus, why do we itch and should we scratch?
Plus, why do we have different blood types?
Plus, why is my mum tone deaf?
And could we live on another planet?
What determines left or right handedness and why are lefties in the minority?
Plus, what鈥檚 the strongest substance in the world?
Does nothing really exist, and where can we find it?
Plus, why is everything in space round?
And can animals count?
