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Why are the seas salty?

How does salt get into the world's oceans, and is melting ice making them any fresher?

• 31 mins

Is every atom unique?

Are atoms as individual as snowflakes 鈥� and if not, where does uniqueness begin?

• 32 mins

How many flies have ever existed?

Flies are everywhere. But just how many have ever lived?

• 30 mins

How does a snake climb a tree?

What gives snakes their gravity-defying climbing skills?

• 27 mins

What is the weight of the internet?

Simple question, tricky answer. To weigh the internet, what should we put on the scales?

• 37 mins

Why am I afraid of this building?

How do buildings affect our emotions 鈥� whether fear or sadness, wonder or joy?

• 26 mins

Why is a ship a 鈥榮he鈥�?

Why are nouns coded as male or female in some languages but not others?

• 30 mins

Why is my handwriting so messy?

Alex Lathbridge explores the genetics, culture and neuroscience of handwriting

• 29 mins

How do fish survive in the deep ocean?

What allows fish to cope with the immense water pressure of the ocean depths?

• 27 mins

Can we improve the shipping container?

This simple metal box enables so much global trade. But could we make it more efficient?

• 32 mins

Why am I symmetrical?

Why is one side of the human body pretty much a mirror image of the other side?

• 31 mins

Can my body regenerate?

Where do our healing powers begin and where do they end?

• 31 mins

What is the voice inside my head?

What鈥檚 the science behind the silent inner voice many of us experience?

• 28 mins

Is the car an apex predator?

The car is a killer but does that make it top of the food chain?

• 39 mins

Are we mature by 18?

Why is 18 considered the start of adulthood in many places? Does science back this up?

• 29 mins

How did the Moon affect the dinosaurs?

The Moon was once much closer to Earth. How did its gravity affect a dinosaur鈥檚 weight?

• 30 mins

Why don鈥檛 sunflowers fall over?

With huge heads on spindly stalks, how do sunflowers defy gravity to stay standing?

• 26 mins

What's the fairest voting system?

Is there a perfect way to elect politicians?

• 32 mins

Why do my armpits smell?

Deodorant hasn鈥檛 been around forever, so is there any evolutionary reason for body odour?

• 26 mins