Car Talk Puzzler: In Search for Bogus Coins

In Search of the Bogus Coins RAY: We have seven stacks of coins, each with 100 coins. Real coins weigh ten grams, and phony coins weigh 11 grams. We’re going to weigh the coins on an analytic scale, which works just like your average bathroom scale – but it’s accurate to within a tenth of a […]

Robert Larson 800-2875 Center Finder

Neat: (from Make: Online) If you’ve ever struggled to locate the center of a circular plate or a piece of round stock using a ruler or a square, you know it can be a tricky proposition. But this cleverly-designed gauge from Robert Larson Woodworking Tools makes short work of the job, and does it more accurately, to […]

Math Pic: Radiator Design

These awesome heating radiators were in the flat (apartment) that we stayed in. I want to make one more. How much pipe do I need to bring to the bending machine?

Math Pics: Underground Carriages

The following is the first of a few pictures that I took while on spring break in London. This is a flyer that is talking about the improvements to the London Underground. The Summer Olympics are coming next summer, so they are trying to increase the capacity. So, how many carriages per train are there […]

Giant Gummy Bear #WCYDWT ?

What questions come to mind? Maybe it’s because it’s the day before spring break, but I’m having trouble coming up with good stuff. Is this worthy of the #wcydwt tag? Features & specs: Dimensions: 9.5″ x 5.5″ x 3.5″ Equivalent to 1400 regular-size gummy bears Weighs approximately 5 pounds 12,600 calories! From: The best question […]

Math Photos: Cliffs of Moher

Alright, last Ireland photo for a while (p1 and p2). If O’Brien’s tower is 22 ft tall, how tall are the Cliffs of Moher? The most useful (is it?) topic in math: proportions.

Math Photos: Giant’s Causeway

Also found in Northern Ireland is the Giant’s Causeway, an amazing place to find basalt columns (whatever they are 😉 ) “Unreal” formation, students always say it looks fake. I’ve used these photos in the polygons angles unit for geometry, but I’m sure there are other uses.