## Math in Books: Math Puzzles

Presh Talwalkar, fellow blogger and founder of the game theory/personal finance website Mind Your Decisions, has recently released an e-book composed of 70 math puzzles previously featured on his blog. He was kind enough to send a review copy my way, so if you enjoy a good math puzzle, read on!

The book is organized into three sections, divided by general subject. There are twenty five counting/geometry puzzles, twenty five probability puzzles, and twenty strategy/game theory puzzles. Some of the puzzles are inspired by discussions Presh has had with his readers over the years, though many are not unique to this book and some are moderately well known. In fact, the intersection of the puzzles in the book with things I have talked about here is nonempty – some examples of overlap can be found here and here.

William Poundstone’s book on the history of Microsoft and the puzzle-based job . . . → Read More: Math in Books: Math Puzzles

## CNN Light Years Guest Post: Did ‘Avengers’ really own box office records?

Over at CNN this month, I talk about the phenomenal success of Marvel’s The Avengers in its stampede over old box office records. But how much stock should we put in these records? Is this blockbuster really the top dog in the record books? Here’s a sneak preview of the article:

When the Avengers assemble, the world opens its collective wallet. In just under three weeks since its international opening, “Marvel’s The Avengers” has earned more than \$1 billion worldwide. In America, it blew through the \$200 million mark over opening weekend alone, and now holds the title of best three-day opening in film history. Or does it?

While dollar signs fuel the engine of Hollywood movie production, they are not necessarily the most objective measure of a film’s success. Most importantly, the dollar is not a static unit of measurement like the meter; as a result of inflation, a

## Math in Books: Who’s #1?

In an earlier post, I closed by hinting at the mathematics of ranking. In this modern era, the topic is particularly relevant: the ranking algorithms are hard at work whenever you type something into a search engine, rate a movie on Netflix, or look at a product on Amazon. It’s also a popular area of study among sports enthusiasts, for whom accurate rankings of the relative strengths of teams can make all the difference in a fantasy league or a betting pool.

Because of all of these accessible applications, it should come as no surprise that the mathematics of ranking is the subject of a new book, titled Who’s #1? The Science of Rating and Ranking. Written by applied mathematicians Amy N. Langville and Carl D. Meyer, the book tackles a variety of methods used to extract ratings or rankings given some collection of input data.

Front Cover!

This . . . → Read More: Math in Books: Who’s #1?

## Help Make it Rain for Math52!

Hi everyone,

If you follow me on Twitter, you may have noticed some activity over the past week in regards to a new Kickstarter project, Math52. From the creators of Mathalicious, this campaign has set the ambitious goal of raising \$164,000 to help transform the way mathematics is taught in our schools. Every week for a year, they will release a video aimed at exploring mathematics through everyday questions – the types of questions that will immediately connect with students, and help motivate them to understand the math required to provide a reasonable answer. But don’t believe me, check out this video!

The team has raised over \$12,000 in a week. This is amazing, but it’s not quite on track for them to reach their goal. So if you give a hoot, please consider donating to this most worthy of causes. Even better, if you have some . . . → Read More: Help Make it Rain for Math52!

## Run for the Ranking

This Saturday, folks from all over the country will be tuning in to the 138th Kentucky Derby. In fact, this year the Kentucky Derby falls on the same day as Cinco de Mayo; undoubtedly the result of this intersection will be a plethora of parties celebrating the melting pot that is America (tacos and mint juleps make for a wonderful combination, I’m sure).

Whenever racing comes up, mathematics can’t be far behind. Gambling is always a popular topic: how are the odds for the different racers determined, for example? But this is a question I will save for another time. Today, inspired by horse racing in particular, I’d like to discuss the following classic logic puzzle.

Suppose you have 25 horses and a 5 lane race track. You have no way to record the finishing times of the horses, but you can race up to 5 horses on the track . . . → Read More: Run for the Ranking