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Why does your heart beat faster when you do sports?

Why do cats knead?

Why do you have a fever when you get sick?

Why do they say dogs have good noses?

Why do horses sleep standing up?

Why is seawater salty?

Believe it or not: Our ears and nose keep growing our entire lives!

Dolphins sleep with one eye open!

Should you wake up a sleepwalker?

Does eating spinach make you strong?

Do bears sleep all winter?

What do small animals eat in winter?