This is the short edition of More or Less.

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Hello and welcome to More or Less on the BBC World Service.

I'm Tim Halford.

This week, Pregnancy due dates.

But before that, we'll hear from Matt Parker

an unusual combination of mathematician and stand-up comedian.

Matt recently wrote a book called Things to Make and Do

in the Fourth Dimension.

It's a collection of tricks, games and puzzles

that reveal bigger lessons about the world around us.

Matt says Matt can even help you find the right life partner.

So I laid myself down on his couch and I opened my heart.

I'm pleased to say I'm happily married,

but occasionally I have doubts as to whether maybe I settled down too soon.

Could I have done better if I waited?

Seems unlikely, but it's quite possible my wife could have done better if she had waited.

So can Matt help me?

I mean, these are very valid concerns and ones you should probably not broadcast on radio,

...