BOOKS: ADD LIKE AN EGYPTIAN

“Good Math,” by Mark Chu-Carroll; $34, from Pragmatic Bookshelf, tells the story of math from imaginary numbers to Egyptian fractions and Roman Numerals.

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EIGHT MATH TALKS TO BLOW YOUR MIND

Blog.Ted.com has “8 Math Talks to Blow Your Mind.” Did you know that the infinity of decimals is larger than the infinity of whole numbers? We thought infinity meant infinity. It bothers real mathematicians too.

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KHAN CAN

KhanAcademy’s free educational videos have been viewed 178 million times on YouTube. Now they’ve launched a “Computer Science” program that teaches kids and adults how to handle JavaScript; that’s the computer language that dominates the Web.

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DO THE MATH

You can type anything you want into the Google search bar, and the more specific the question, the better the answer. Now you can also use Google to graph equations.

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GEEK TIME

We didn’t think the $115 price tag was worth it, but the new “4-bit Steel” watch from Cadence is already sold out. It uses a four-bit binary number system to mark the hours. You don’t need to know the binary system to read it, however, because the marks are all in the same position they would be on an ordinary analog watch. Still, the whole point is to raise your geek score.We tried a cheaper version, which sells for $90 from CadenceWatch.com and is not sold out yet. The only drawback was no glow in the dark minute and hour hands; only the second hand glows not too useful. Programmers should really zero in on this, because the binary system is […]

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THE NEW MATHEMATICA

New version of Mathematica lets you use free form language instead of programming language.

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BILL GATES’ FAVORITE VIDEO SITE

KhanAcademy.org has 1800 mini videos on science, banking, math, and history, all narrated by Sal Khan, a former hedge fund manager. Bill Gates is a fan. Its focus is math and science, but we watched a good video on the bailout.

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SALARY COMPARISONS

“Salary Comparison” lets you compare salaries in various U.S. cities. For example a $37,000 salary in Cleveland, Ohio  is equivalent to a $60,000 salary in San Francisco, because the cost of living there is so much higher.  Go to tinyurl.com/sconverter. The converter is by WolframAlpha, the mathematical software company.

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A POWER TOY FOR EVERYONE

If you have a computer running Windows XP — and most of the world does, it’s worth going to the Microsoft home site (Microsoft.com) and downloading some power toys.

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THE WOLFRAM WEB

WolframAlpha.com is getting a huge amount of buzz as a Google killer application, but that’s not really what it’s about.

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