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They may not be able to walk, but trees do talk — at least to each other.
Clothing is made of threads, which are made of smaller-still fibres. And that’s where the dirt hides.
Bird poo is usually coloured white. This is because of how birds excrete excess nitrogen. But the poo can sometimes be a different colour – depending on the food. And different creatures have evolved three main ways of getting rid of excess nitrogen.
Even though it sounds totally crazy, astronomers are very confident that black holes exist. Our galazy is really old, it should carry at least 100 million black holes but we’ve found only a couple of dozen of them.