See the August 21 Solar Eclipse using Stellarium

There’s no way I can go to see the upcoming solar eclipse in the United States – I live too far away. However, I fired up my favourite solar system simulator, called Stellarium, and took some screenshots I’d like to share with you.

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How To Vote Mathematically!

[This is a back issue of one of this site’s newsletters]

About half of you reading this are from the United States. At least, that’s my guess, based on my website‘s traffic statistics.

About a quarter – half of that half – will be voting in the coming Presidential Election, or have already done so. At least, that’s my guess, based on turnout stats I skim-read on Wikipedia.

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The Puzzle Universe – A History of Mathematics in 315 Puzzles

The other day I received a marvellous package in the post. Inside was a book, The Puzzle Universe, by Ivan Moscovich, published by Firefly Books. Ivan Moscovich has made a career out of making amazing mathematical puzzles and games.

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More Infinite Number Weirdness

Some time back, I had a bad habit. I would open a cupboard to get something, then forget to close it. My wife was somewhat miffed by this – understandably, because our kitchen had an infestation of moths at the time. So, she found herself having to tell me, again and again – close the cupboard doors!

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Deconstructing April Fool’s Day

Okay, I admit it – my previous blog post was published on April 1. The foundations of mathematics are not really under attack, not now. But they were once!

Here’s a famous puzzle: imagine a village barber, who cuts the hair of everyone who doesn’t cut their own hair. Sounds simple enough, but who cuts the barber’s hair?

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What Is Counting?

My son asked me a riddle this afternoon – “What goes up but never down?”

I said “An elevator!”

He seemed surprised by my answer, so I said “Voyager I!”

Then he complained that the riddle was so generic, there were millions of possible answers. I asked him if there was some traditional answer I was supposed to give, and he said that he didn’t know of one.

Do you?

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