# math

## Math Will Rock Your World!

A couple of months ago I was cleaning out my cabinets stuffed with old magazines. Sifting through tons of old editorials a few issues caught my attention that I decided to keep. One of them was a BusinessWeek issue from January 23, 2006. That's right, that was 7 years ago!

The cover story claims that, "More math geeks are calling the shots in business."

## In exactly 76 days, on May 2, 2013, I will repeat a journey which I made 10 years ago.

In my previous blogs I had mentioned that I was born and raised in Ukraine. In 2002, my mother and I made a long journey and moved to United States. And this year, for the first time in over 10 years, I will make the journey "home"!

## Where Are You?

Thanks to Egil Randi Jergan for sending information about additional solutions for the Where Are You? puzzle (page 69).

## Polyominoes

Thanks to Egil Randi Jergan for sending in additional information about the Polyominoes puzzle (page 99).

The solution to the extra challenge is correct. There are 35 different hexominoes. A reader can find diagrams of 34 of them on pages 161 and 162. The 35thhexomino is a 2 square by 3 square figure.

## Boxes, Cubes, and Nets

Thanks to Egil Randi Jergan for sending in additional information about the Boxes, Cubes, and Nets puzzle (page 71).

The solution on pages 161 and 162 should also include the diagram of a 2 square by 3 square hexomino. There are 35 different hexominoes, but only 34 are shown on these pages.

## Build a Cube

Thanks to Egil Randi Jergan for sending in additional information about the Build a Cube puzzle (page 66).

In addition to the seven hexominoes shown in the solution (page 152), there are are four additional hexominoes that can be folded to form a cube. They are the figures labeled N7, N8, N9, and N10 on page 162.

The solution on page 152 should also include the answer to the second question of the puzzle: How many (hexominoes) are there for which it (folding into a cube) is not possible? The answer is 24.

## Möbius ribbon

Did you know that if you take a long rectangular sheet of paper and you fold the two extremities making a 180° degrees angle (between them) and if you make ends meet, you’ll create a Möbius ribbon (or strip)?

Well, it’s a ribbon with two dimensions and only one face and one edge!  You can check using a pen or your finger.

Möbius ribbon was named by the name of its founder August Ferdinand Möbius, who was a well known German mathematician and pioneer of the topology in the 19th century.

## PROJETO: “SUSTENTABILIDADE AMBIENTAL” EM PARCERIA SEED

No dia 01 de agosto de 2012, foi realizado no turno vespertino do Colégio Estadual Barão de Mauá uma aula interdisciplinar com a comunidade estudantil onde foram abordados os seguintes temas: