pi

pi monte carlo shotgun math funny - 8416855552
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Via Medium:

Dumoulin and Thouin's idea is to use the distribution of shotgun pellets rather than sand or rice (which would presumably be in short supply in the post-apocalyptic world). So these guys set up an experiment consisting of a 28-inch barrel Mossberg 500 pump-action shotgun aimed at a sheet of aluminium foil some 20 metres away.

Of their 30,000 pellet holes, they chose 10,000 at random to perform this estimation trick. They then use the remaining 20,000 pellet holes to get an estimate of π, safe in the knowledge that importance sampling allows the calculation to proceed as if the distribution of pellets had been random.

The result? Their value of π is 3.131, which is just 0.33 per cent off the true value. "We feel confident that ballistic Monte Carlo methods constitute reliable ways of computing mathematical constants should a tremendous civilization collapse occur," they conclude.
trademarks pi - 8208910336
Via Wired
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Multiple sellers on online marketplace Zazzle were shocked to find last week that their designs had been taken down as a result of a cease and desist notice by a fellow named Paul Ingrisano, alleging that their work infringed upon his registered trademark.

The trademark in question is the symbol for pi. It refers directly to the symbol followed by a period. Even though the sellers on Zazzle did not use a pi with a period, they still received cease and desist letters.

Wired spoke to Mark Lemley, a law professor at Stanford University, who said: "if you want to sell T-shirts and on the tag your brand name is the symbol pi, I think that's a reasonable trademark. But if what you want to do is actually prevent people from using the symbol pi on a T-shirt, then I think you're missing the point of trademark law."

So why did Ingrisano own the trademark? According to his Facebook page he works at "Pi Production Corp".