March 14, 2021

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March 14, 2019

# Now to THE FUNNY SIDE OF PI DAY

### So cute or they’re pissed.

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## Use the WIFI Force, Luke!

February 23, 2017

So you have cracked the WIFI password (above). It’s time for some Fun, Fun, Funnies.

Here are Mathspig’s favourite WIFI names:

Duracell Bunny Arrested

Charged With Battery

FBI Surveillance Van 4

Go home tourists

And check the links at the end of this post for a little bit of weird.

## Weird 1:

It leads to a meme of people posting ‘put your head in a refigerator’ selfies. Why? Dunno.

## Weird 2:

The Google page is askew!!!! Really. What is the angle of the page below horizontal. You can work it out.

## 3. Anamorphic Cube

February 11, 2016

This is quite a challenge. The idea is to draw an anamorphic cube so that the image, once projected onto a curved surface looks like a cube. You will find the template or graph for this exercise on Mathspig here.

It took me several goes to get it … sort of … right.

Step 1: Make silver foil/cardboard cylinder to fit the dotted circle on the grid below.

Step 2: Draw in the corners of the cube on the square grid and match these corners on the curved grid.

Step 3: Draw in the three vertical sides of the cube and match these lines on the curved grid.

Step 4: Draw in the top and bottom horizontal sides of the cube on the square grid and match these on the curved grid.

Getting tricky now.

Step 5: Draw in the blue, orange and green sides of the cube on the square grid and match these on the curved grid.

Step 6: Place silver cylinder on dotted circle.

Step 7: Can you see the cube?

Step 8: Here’s a closer look.

An even better Anamorphic Cube.

Anamorphic Illusion Art of a Rubik’s Cube

By John Snow

Amazing Anamorphic Illusions by Brusspup

May 21, 2015

# Mathspig

## Hair Maths 4: The Great SHAMPOO rip off

April 27, 2015

According to Salon.com:

## There are two types of ingredients in shampoo. One type cleans your hair. The other type strokes your emotions.

Shampoo has one main ingredient:

# DETERGENT

The two most common shampoo detergents are ammonium lauryl sulphate and ammonium laureth sulphate. That’s all you need to clean your hair. All those shampoo bottles. All that supermarket shelf space offer THE SAME PRODUCT.

Other ingredients include: perfume, dye, preservative, foaming agent, acid (The problem is hair swells in an alkaline solution eg with soap when rinsed out the hair shrinks making knots impossible to brush out. ARggghhhhh!), thickeners, thinners, sheen additive, pearlesence powder (makes shampoo look pearly) etc

According to Steve Antczak, Co-author of Cosmetics Unmasked: Your family guide to safe cosmetics and allergy-free toiletries,

## A typical shampoo is mostly water, containing between 5 and 20 per cent detergent, with shampoo for dry hair containing less detergent than shampoo for greasy hair.

See New Scientist, Sept , 2009

So the potency of shampoo looks something like this:

Assume you buy a 500ml bottle of shampoo for \$10. Now you can work out how much some shampoo manufacturers rip you off by filling in this table:

How much do you pay for water in shampoo? The Answer is here.

What does Bill Bunn from Salon.com recommend?

## Maths Mystery Box 6: WEIRD

February 19, 2015

Middle school maths challenge

Arithmetic and numbers that … like totally …  weird you out!

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## 10 Quirky Quotes for Maths Teachers

May 2, 2014

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Photo source: 1. Breyers factory Philadelphia, 2. wrongsideoftheheart blog, 3. wsj.com, 4. Unsourced, 5. Dsilymail, 6. Unsourced, 7. Unsourced, 8. Watvhistory, 9. Maths-shirt- nevernotanerd website, 10. unsourced