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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