Do fish have eyelashes?

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My 5-year-old and I made a shoebox aquarium (see photo) during the holidays. She has been learning about the natural environment at school and decided to get creative. She made fish and an octopus and a shark, and decorated them all with googly eyes, smiley faces and glitter sparkles. She drew eyelashes on the fish, which made them look super-cute, but it got my 9-year-old thinking:

Do fish actually have eyelashes? What about eyelids? And do they need to blink or does living in water mean that they can always keep their eyes open?

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Why is sweat salty?

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Sweating is something that we all do, every day. We especially sweat on hot days, when we do exercise, and sometimes when we feel nervous! And the reason we sweat is to keep our bodies at the right temperature to work properly.

Sweat can feel wet and sticky on your skin, and sometimes it can get a bit smelly. But my 9-year-old wants to know why sweat tastes salty.

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