Sweet ukulele tribute to the largest Mersenne Prime

In the end of year episode (MP3) of the BBC's More or Less stats podcast, Tim Harford talks to a variety of interesting people about their "number of the year," with fascinating results.

But the crowning glory of the episode is Helen Arney's magnificent musical tribute to Mersenne 48, the largest Mersenne Prime ever calculated, which came to light in 2013. (Arney herself is going out on tour of the UK, for the delightfully named Full Frontal Nerdity tour)

Rewriting sensationalist headlines for mathematical correctness


Math With Bad Drawing's "Headlines from a Mathematically Literate World" is a rather good -- and awfully funny -- compendium of comparisons between attention-grabbing, math-abusing headlines, and their math-literate equivalents.

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Vi Hart explains logarithms

The incomparable, incredible, mathematically gifted Vi Hart continues to make the world a better place for numbers and the people who love them, with a video explaining logarithms. Watch this one today (here's the torrent link).

88 nonillion imaginary artworks for the Tate


Shardcore writes, "The Tate recently released a 'big data' set of the 70k artworks in their collection. I've been playing with it and finding all sorts of fun to be had. The latest experiment uses the Tate data as a springboard to algorithmically imagine new artworks - 88,577,208,667,721,179,117,706,090,119,168 to be precise."

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Understanding spurious correlation in data-mining


Last May, Dave at Euri.ca took at crack at expanding Gabriel Rossman's excellent post on spurious correlation in data. It's an important read for anyone wondering whether the core hypothesis of the Big Data movement is that every sufficiently large pile of horseshit must have a pony in it somewhere. As O'Reilly's Nat Torkington says, "Anyone who thinks it’s possible to draw truthful conclusions from data analysis without really learning statistics needs to read this."

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Young brothers explain Bayes's theorem

These two young fellows are brothers from Palo Alto who've set out to produce a series of videos explaining the technical ideas in my novel Little Brother, and their first installment, explaining Bayes's Theorem, is a very promising start. I'm honored -- and delighted!

Technology behind "Little Brother" - Jamming with Bayes Rule

Statistics Done Wrong: a guide to spotting and avoiding stats errors


Alex Reinhart's Statistics Done Wrong: The woefully complete guide is an important reference guide, right up there with classics like How to Lie With Statistics. The author has kindly published the whole text free online under a CC-BY license, with an index. It's intended for people with no stats background and is extremely readable and well-presented. The author says he's working on a new edition with new material on statistical modelling.

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A visit to the Indian temple where "0" was invented

The BBC's Alex Bellos travels to Gwalior, an Indian city that contains a temple with the oldest known use of the number "0". It's part of an effort to figure out why zero would appear in India, and not in other, earlier civilizations that were mathematically adept. From Bellos' perspective, part of the answer might lie in theology — a mathematical representation of the mystical idea of "nothingness".

American education's use of "value added measures" is statistically bankrupt

American teachers are widely assessed on the basis of "value added measures," a statistical tool for analyzing the outcomes of their teaching. But as Jerry Genovese points out, this is statistically completely bankrupt -- unless you randomize your samples, you get no insight into the quality of the teaching. I asked my father, Gord Doctorow -- a mathematician, math teacher, and professor of education -- what he thought of Genovese's piece, and he sent me some great material, which you'll find after the jump.

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Statistics explained with the help of modern dance

If you're the type of person who really needs some good visuals to make a concept stick in your head, this series of YouTube videos made by the British Psychological Society Media Centre will help you remember the meanings behind statistical concepts like "correlation", "frequency distributions", and "sampling error". There are four videos in the series so far, and they do a great job of painting pictures around abstract ideas. Bonus: Soothing music.

Via Openculture

90 percent of Tor keys can be broken by NSA: what does it mean?

Errata Security CEO Rob Graham has published a blog-post speculating that ninety percent of the traffic on the Tor anonymized network can be broken by the NSA. That's because the majority of Tor users are still on the an old version of the software, 2.3, which uses 1024 RSA/DH keys -- and at keylengths of 1024 RSA/DH crypto can be broken in a matter of hours using custom chips fabbed at an estimated cost of $1B. It seems likely that the NSA has spent the necessary sum and sourced these chips (likely from IBM).

This isn't the same as being able to decrypt all of Tor in realtime, but it does suggest that the NSA could selectively decrypt its stored archives of Tor traffic.

However, the new version of Tor, 2.4, uses elliptical curve Diffie-Hellman ciphers, which are probably beyond the NSA's reach.

Graham faults the Tor Project for the poor uptake of its new version, though as an Ars Technica commenter points out, popular GNU/Linux distributions like Debian and its derivative Ubuntu are also to blame, since they only distribute the older, weaker version. In either event, this is a wake-up call that will likely spur both the Tor Project and the major distros to push the update.

Yesterday's revelations about the NSA's ability to decrypt 'secure' communications were taken by many to mean that the NSA had made fundamental mathematical or computing breakthroughs that allowed it to decrypt securely enciphered messages. But it's pretty clear that's not what's going on.

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NSA probably hasn't broken strong crypto


You may have heard speculation that the NSA has secretly broken the strong cryptographic systems used to keep data secret -- after all, why collect all that scrambled data if they can't unscramble it? But Bruce Schneier argues (convincingly) that this is so impossible as to be fanciful. So why have they done this? My guess is that they're counting on flaws being revealed in the cryptographic implementations in the field (or maybe they've discovered such flaws and are keeping them secret). Or they're hoping for a big breakthrough in the future (quantum computing, anyone?).

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Great moments in pedantry: Double Stuf Oreos not actually double stuffed

In fact, the Double Stuf Oreos tested by a high school math class in Queensbury, N.Y. contained only 1.86x the amount of stuff that was in a regular Oreo. A Nabisco spokeswoman, responding to the scandal, says the measurements must have been inaccurate.

Some real math on the real risk of shark attacks


Great white shark. © Oceana/David Stephens.

Shark attack stats: "The real threat is humans. For every one human killed by a shark, there are approximately 25 million sharks killed by humans."

About 200 million people go to U.S. beaches each year. About 36 of those hundreds of millions are attacked by sharks. Most of them survive. In contrast, more than 30,000 of those millions of beach-goers are to be rescued from surfing accidents. And many of those humans each year die, or must be rescued, from drowning incidents in which no other creature is to blame.

So, will we see Human Week, or Human-nado mockumentaries any time soon?

[Oceana.org]

At VW's request, English court censors Usenix Security presentation on keyless entry systems for luxury cars


Flavio Garcia, a security researcher from the University of Birmingham has been ordered not to deliver an important paper at the Usenix Security conference by an English court. Garcia, along with colleagues from a Dutch university, had authored a paper showing the security failings of the keyless entry systems used by a variety of luxury cars. Volkswagon asked an English court for an injunction censoring his work -- which demonstrated their incompetence and the risk they'd exposed their customers to -- and Mr Justice Birss agreed.

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