This is a fantastic way to layout this problem posted on twitter by Olivier Longuet and pointed out to me by Ralph Pantozzi. The drawing progression is on the right or you can etch the left (blank) onto wood, and add the finished pieces as you figure it out. Our files are here if you want a jpg, svg, Corel

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## Take and Make: Moscow Puzzles Crayfish and Flower

Here are two fun puzzles you can find in this classic book. The files to make them are right here! (secret: The wood is colored with Bingo stampers) Moscow Flower and Crayfish, Laser cut file types: Corel 2020, Adobe Illustrated, SVG, JPG

## Take and Make: Parallel Ruler and Compass Rose

In 2019, we brought our suite of Navigation Math to New York to share how we relate math to Texas History and the voyage of La Belle which is on exhibit at the Texas State History Museum. Files to make our version of the Parallel Ruler are here. Files to make our version of the Compass Rose are here. Participants

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## Webinar: Making the Most of Math Connections at your Museum or Historical Site

Elizabeth Lay, Claire Steffen and I had the opportunity to present a webinar through the Texas Historical Commission today. We discussed ways that museums can enhance visitor experiences with math, showed a variety of examples of math activities at museum locations and talked about our process in developing connected activities. Our Presentation Slides are here The Handout Recording Hosted by

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## Take and Make: Genaille-Lucas Rulers

Genaille-Lucas Rulers are pretty cool. They are a clever calculator that you can use to multiply some pretty big numbers. MathHappens summer staff member Anh Nguyen made a colorful set from scratch in Corel Draw that you can download and print on a laser or inkjet printer. Feel free to copy, explore, and use. It’s a great project to try

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## Take and Make: Sum of Squares of Odd Numbers – Freese Transformation

This Geometric Transformation shows how the sum of the first 6 Odd Squares is the square of 6, or 36. Its the classic “proof without words”. Freese’s Transformation also shows this relationship, but his “squares” all have sides sqrt 1, sqrt 3, sqrt 5, and so on. Freese Corel File, Adobe Illustrator File, Jpg printable

## Take and Make: Experimental Mathematics Cucumber Edition

Here’s a fun one! Inspired by a conversation with Chris Daniels of Public Math. He said roll paper around a cylinder and cut on an angle to get an ellipse and produce a sine wave. So we did! And you can too. Then you can make a roller from ellipses, reflect your sine curve and roll the elliptical roller along

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## Take and Make files are spreading! Fantastic!

It is very exciting to see our files being used and the great results! Gotta love the math and maker communities on twitter! Thank you @MathHappensOrg https://t.co/yJ63LBiqJp — Ralph Pantozzi (@mathillustrated) March 13, 2020

## Women in Steam at the Thinkery

Women in Mathematics! Katherine Johnson calculated trajectories, parabolic and otherwise for NASA in the 1960s. Almost 70 years earlier Mary Boole invented curve stitching to teach the mathematical properties of parabolas to children. We made some really great foldable parabolas to connect to the work of both these women in math. Here’s the laser file – we cut the holes

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## Take and Make: Hinged Parabola Stretcher

Super simple and yet kind of cool. You need a machine screw, a wing nut, some scrap wood about 4″x.5″, and some stretchy elastic. Directions and Files Here. Check the video on Twitter to see how it moves. Article from American Mathematical Association here. Also if you don’t want to make from scratch, we could send you the parts. Fill

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