## THIS IS MATH!: Amaze your friends with The Baby Hummer card trick

Welcome to THIS IS MATH! a new series from math editor Vickie Kearn.

This is the first of a series of essays on interesting ways you can use math. You just may not have thought about it before but math is all around us. I hope that you will take away something from each of the forthcoming essays and that you will pass it on to someone you know.

April is Math Awareness Month and the theme this year is Mathematics, Magic, and Mystery. There is a wonderful website where you will find all kinds of videos, puzzles, games, and interesting facts about math. The homepage has a poster with 30 different images. Each day of the month, a new window will open and reveal all of the wonders for that day.

Today I am going to elaborate on something behind window 3 which is about math and card magic. You will find more magic behind another window later this month. This particular trick is from Magical Mathematics: The Mathematical Ideas that Animate Great Magic Tricks by Persi Diaconis and Ron Graham. It is a great trick and it is easy to learn. You only need any four playing cards. Take a look at the bottom card of your pack of four cards. Now remember this card and follow the directions carefully:

1. Put the top card on the bottom of the packet.
2. Turn the current top card face up and place it back on the top of the pack.
3. Now cut the cards by putting any amount you like on the bottom of the pack.
4. Take off the top two cards (keeping them together) and turn them over and place them back on top.
5. Cut the cards again and then turn the top two over and place them back on top.
6. Give the cards another cut and turn the top two over together and put them back on top.
7. Give the cards a final cut.
8. Now turn the top card over and put it on the bottom of the pack.
9. Put the current top card on the bottom of the pack without turning it over.
10. Finally, turn the top card over and place it back on top of the pack.
11. Spread out the cards in your pack. Three will be facing one way and one in the opposite way.
12. Surprise! Your card will be the one facing the opposite way.

This trick is called the Baby Hummer and was invented by magician Charles Hudson. It is a variation on a trick invented by Bob Hummer.

So where’s the math?
The math behind this trick covers 16 pages in the book mentioned above.

THIS IS MATH! will be back next week with an article on Math-Pickover Magic Squares!

## Join MoMath in New York City on October 26 for a celebration of Martin Gardner

Martin Gardner, an acclaimed popular mathematics and science writer and author of Undiluted Hocus-Pocus: The Autobiography of Martin Gardner, would have had his 99th birthday this month. In honor of this special occasion, the mathematical community is putting together a number of birthday celebrations.

MoMath joins the fun on October 26th from 10:00 – 5:00 with a Celebration of the Mind.

At this family-friendly event, math fans of all ages will enjoy some close-up magic tricks, explore favorite Gardner puzzles, and make their own hexaflexagon to take home (how many people can say they have their own hexaflexagon?!). As an added challenge, try to spot the two exhibits that Gardner asked Museum directors to include in MoMath.

Later that evening, MoMath will welcome Martin Gardner’s son James Gardner and a panel of experts for a discussion:

 Event: Who is Martin Gardner? A Conversation with Friends, Colleagues, and Family Date and Time: Saturday, October 26, 6:30 pm What is it? A panel of people who knew Martin Gardner well will share their favorite stories about him and reveal just how important his contributions have been to mathematics and to math lovers around the world. Ask questions, talk with the presenters, and share your own memories and stories. Who is participating? James Gardner (University of Oklahoma, Martin Gardner’s son) John Conway (Emeritus Professor of Mathematics, Princeton University) Mark Setteducati (President, Gathering 4 Gardner) Neil Sloane (The OEIS Foundation and Rutgers University) Colm Mulcahy (Spelman College and Author of Mathematical Card Magic: Fifty-Two New Effects) Location: National Museum of Mathematics 11 East 26th Street, New York, NY 10010 Contact: (212) 542-0566 | info@momath.org

Space will fill up for this event, so please pre-register here: http://momath.org/about/upcoming-events/)

There are many Celebration of Mind events taking place around the world. Check out the map (http://celebrationofmind.org/) to find events close to you.

Come and celebrate the joy of math!

## Martin Gardner Celebration At Princeton

Martin Gardner, an acclaimed popular mathematics and science writer and author of Undiluted Hocus-Pocus: The Autobiography of Martin Gardner, would have had his 99th birthday this month. In honor of this special occasion, the mathematical community is putting together a number of events celebrating this Gardner.

At Princeton University on October 25th from 6:30 – 8:30 PM in the Friend Center, Room 101, there is a free public lecture by Tadashi Tokieda on toy Models. He will share with you some unique toys he has made and collected, and show you the mathematics and physics behind them. Following the lecture, a panel of people who knew Martin Gardner well will share their favorite stories about him. You will have time to ask questions and talk with the presenters and share your memories as well.

Mark Setteducati (President, Gathering 4 Gardner) Panel Moderator
James Gardner (University of Oklahoma, Martin Gardner’s son)
John Conway (Emeritus Professor of Mathematics, Princeton University)
Colm Mulcahy (Spelman College and Author of Mathematical Card Magic: Fifty-Two New Effects)

There are many Celebration of Mind events taking place around the world. Check out the map (http://celebrationofmind.org/) and you can find event close to you.

Come and celebrate the joy of math!

## Martin Gardner’s Birthday Bash Celebration

Martin Gardner, an acclaimed popular mathematics and science writer and author of Undiluted Hocus-Pocus: The Autobiography of Martin Gardner, would have had his 99th birthday this month. In honor of this special occasion, the mathematical community is putting together a number of birthday celebrations.

MoMath joins the fun on October 26th from 10:00 – 5:00 with a Celebration of the Mind.

At this family-friendly event, math fans of all ages will enjoy some close-up magic tricks, explore favorite Gardner puzzles, and make their own hexaflexagon to take home (how many people can say they have their own hexaflexagon?!). As an added challenge, try to spot the two exhibits that Gardner asked Museum directors to include in MoMath.

Later that evening, MoMath will welcome Martin Gardner’s son James Gardner and a panel of experts for a discussion:

 Event: Who is Martin Gardner? A Conversation with Friends, Colleagues, and Family Date and Time: Saturday, October 26, 6:30 pm What is it? A panel of people who knew Martin Gardner well will share their favorite stories about him and reveal just how important his contributions have been to mathematics and to math lovers around the world. Ask questions, talk with the presenters, and share your own memories and stories. Who is participating? James Gardner (University of Oklahoma, Martin Gardner’s son) John Conway (Emeritus Professor of Mathematics, Princeton University) Mark Setteducati (President, Gathering 4 Gardner) Neil Sloane (The OEIS Foundation and Rutgers University) Colm Mulcahy (Spelman College and Author of Mathematical Card Magic: Fifty-Two New Effects) Location: National Museum of Mathematics 11 East 26th Street, New York, NY 10010 Contact: (212) 542-0566 | info@momath.org

Space will fill up for this event, so please pre-register here: http://momath.org/about/upcoming-events/)

There are many Celebration of Mind events taking place around the world. Check out the map (http://celebrationofmind.org/) to find events close to you.

Come and celebrate the joy of math!