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Is water wet?

The wetness of water seems obvious - but dive into the science and it's not so clear cut

• 26 mins

Are humans naturally monogamous?

Why is one partner usually the norm for humans around the world?

• 27 mins

Are there global food allergy hotspots?

Do food allergies vary around the world – and if so, why?

• 29 mins

Where in the world will I weigh least?

We tackle gravity - a fundamental force of the universe, yet also an everyday mystery

• 26 mins

How do you measure a mountain?

As sea levels rise, will mountains shrink? How do we measure height above sea level?

• 26 mins

Why do animals swallow rocks?

Answering your questions about life, Earth and the universe

• 29 mins

Why am I always late?

Why do some people find it easier to be punctual than others?

• 26 mins

Can we feed everyone?

We ask leading agricultural experts about global food security

• 31 mins

Why can't I fall asleep?

Why is getting to sleep much harder for some people than others?

• 28 mins