## The door is ajar

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$d1= andd2=$

## Calculus

SONIC PICTURE credit: By Belinda Hankins Miller from U.S.A. [CC BY 2.0 (https://creativecommons.org/licenses/by/2.0) or CC BY 2.0 (https://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons, from https://commons.wikimedia.org/wiki/File:Sonic_Drive_in.jpg

## $-\left(-5\right)=5$,    Is it really right?

### The Moonwalk

When I started my PhD I had to take a qualifying exam in algebra and I learned for the first time, what minus really means in math. In math, -5 is the thing that you add to 5 to get 0.

$-5 +5=0$

just like antimatter is the thing that you add to matter to get zilch

$(-matter) +matter=0$

just like antimother is the thing that you add to mother to make mother VANISH

$(-mother) +mother=0$

and -(-5) is the thing that you add to -5 to get 0.

$- (-5) + (-5) =0$

and that is why -(-5) has to be 5, because 5+(-5)=0.

## Persi Diaconis

### My story of meeting Persi

$d1= andd2=$ then $d1d2= =x2 .$

## Gauss in prep

$10100$ $5050$

## Thank you.

This was a 45min talk as a concluding speaker at the Strengthening Engagement and Achievement in Mathematics and Science (SEAMS) program for year 11 High School students that was held at the University of Melbourne for three days 21-23 January 2019.