Why do I have to wash my hands?

How many times a day do you wash your hands? I probably wash mine 100 times! That might seem like a lot but I wash them every time I go to the loo, after I feed or stroke the cat, before and during cooking, before I eat (and sometimes afterwards), after I stack dirty dishes in the dishwasher, and each time I clean up mess and spills around the house.

So why do I wash my hands so often? And why is hand-washing important?

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How long would it take a cheetah to run around the world?

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Cheetahs are big cats that live in Africa, Asia, India and the Middle East. They can run super-fast to catch their prey when they are hunting for food. But running at top-speed is very tiring, so cheetahs only do it for short periods of time.

My 6-year-old wondered, what if a cheetah could run at its top-speed without getting tired…? How long would it take the cat to run all the way around the world?

Let’s do the maths and find out!

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How do mermaids go to the loo?

My 6-year-old loves dressing up as a mermaid and is disappointed that she can’t become a mermaid when she grows up. But the thing she really wants to know is, how do mermaids wee and poo?

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The trouble is, mermaids are imaginary creatures so there aren’t any real ones that we can study. But if we believe that mermaids are like humans with a fishy tail instead of legs, perhaps we can make a prediction about how they might go to the loo?

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How does temperature work?

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This question was asked on a cold Winter’s day. The water in the bird bath had frozen and I used hot water from the kettle to thaw it so the birds could drink. When I explained to my 6-year-old that water freezes at zero degrees Celsius, she wondered if that was the coldest that things can get. But it isn’t – in fact some things can get much, much, much colder!

So what happens when things get hot or cold and how do we measure temperature?

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