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How high can birds fly?

What altitude can birds cope with, and which species soars highest?

• 27 mins

Is my smartwatch good for my health?

Do smartwatches reliably monitor fitness? And can they make us healthier?

• 27 mins

Why can't I remember my early childhood?

Some huge milestones happen in our first years of life - but why do we forget them?

• 27 mins

Is anything truly random?

A question about bathroom tiles has us wondering whether everything is pre-determined

• 26 mins

Why isn't the sky green?

Why do we see so many colours in the sky, but never green?

• 27 mins

Whatever happened to tangerines?

Can we track down a tangerine variety lodged in one listener's memory?

• 28 mins

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