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The incredible ‘Birthday Problem'

The incredible ‘Birthday Problem'
By Mark Mason on 12-10-12 14:01. Comments (0)
How many people do you have to gather together in a room before it becomes more likely than not that at least two of them will share a birthday? This teaser is something I mention on the Central Line walk (which passes the wonderful Gresham College, where I first learned about it.) For years I've struggled to convince people that the answer - just 23 - is correct. But recently I found a way of doing it that really brings the truth of the puzzle home ...

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Walks

Inspired by my book Walk the Lines: the London Underground - Overground, each of these trivia-packed walks uncovers London’s history by following a section of a Tube line ... at street level.
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London Bus

A London double decker bus can lean further from the vertical without falling over than a human can. What a great way of learning about centres of gravity. The reason a Routemaster can lean so far is that there's a great long strip of pig-iron welded to its base, keeping you top-deckers safe as you go round corners. If you want reassuring photographic evidence, click here