You will need to know the difference between Friday and a fried egg. It’s quite a simple difference, but an important one. Friday comes at the end of the week, whereas a fried egg comes out of a hen. Like most things, of course, it isn’t quite that simple. The fried egg isn’t properly a fried egg till it’s been put in a frying pan and fried. This is something you wouldn’t do to a Friday, of course, though you might do it on a Friday. You can also fry eggs on a Thursday, if you like, or on a cooker. It’s all rather complicated, but it makes a kind of sense if you think about it for a while.

It’s also good to know the difference between a lizard and a blizzard. This is quite an easy one. Though the two things sound very much alike, you find them in such very different parts of the world that it is a very simple matter to tell them apart. If you are somewhere inside the Arctic circle then what you are looking at is probably a blizzard, whereas if you are in a hot and dry place like Madagascar or Mexico, it’s more likely to be a lizard.

This animal is a lemur. There are lots of different kinds of lemurs, and they nearly all live in Madagascar. Madagascar is an island—a very large island: much, much larger than your hat, but not as large as the moon.

The moon is much larger than it appears to be. This is worth remembering because next time you are looking at the moon you can say in a deep and mysterious voice, “The moon is much larger than it appears to be,” and people will know that you are a wise person who has thought about this a lot.

This particular kind of lemur is called a ring-tailed lemur. Nobody knows why it is called this, and generations of scientists have been baffled by it. One day a very wise person indeed will probably work out why it is called a ring-tailed lemur. If this person is exceedingly wise, then he or she will only tell very close friends, in secret, because otherwise everybody will know it, and then nobody will realise how wise the first person to know it really was.