# Can You Solve Isaac Newton's Tree Puzzle?

This week’s puzzle is not about gravity, though you’d be excused for suspecting as much. After all, when most people read “Isaac Newton” and “tree” in the same sentence, they think also of falling apples. But this week’s puzzle, which is widely attributed to Newton, is actually an exercise in orderly arboriculture.

# How Will You Celebrate The Pi Day Of The Century?

Happy Pi Day! How are you celebrating the transcendental, irrational mathematical constant central derived from circles on 3/14/15 at 9:26:53? For me, it's going to be giggling over physicists engaging in an epic chalk battle, and devouring an apple-ginger pie.

# Try Your Hand At This Surprisingly Difficult Matchstick Puzzle

Matchstick puzzles (aka toothpick puzzles) typically involve adding to, subtracting from, or rearranging an initial configuration of matchsticks to create another, target configuration of matchsticks. Some of these puzzles can get rather complicated. This matchstick puzzle is more straightforward than most, but…

# How To Prove A Geometric Formula With A Clementine And A Piece of Paper

Here's a fun demonstration from Cornell maths professor Steven Strogatz. Take a clementine (or any spherical, peelable fruit) and trace around its widest part four times. Then peel it. Flatten out the peelings as best you can and divvy them up evenly among the circles. Voilà! Tangible proof that the the surface area…

# How Does This Mind-Bending Illusion Work?

No, there are no magnets in there. The ball is rolling just the way you see it.

# Think You Know The Solution To This Classic Riddle? Think Again.

Today's puzzle will be posed in two halves. The first half is a classic riddle – in fact, I suspect many of you will have heard it before. The second half, however, is an extension of the riddle that reveals its most common solution be be insufficient.

# A 19th Century Math Genius Taught Us The Best Way To Hold Pizza

We've all been there. You pick up a slice of pizza and you're about to take a bite, but it flops over and dangles limply from your fingers instead. The crust isn't stiff enough to support the weight of the slice. Maybe you should have gone for fewer toppings? No. There's no need to despair.

# You Are Cutting Your Bagels Wrong

How are you cutting your bagels? With a boring straight down the middle cut, or into a delicious linked breakfast chain, using the Mobius strip method?

# The Best Kind of Math Is Edible, Chocolate Math

Chocolatier Rafael Mutter's Chocolate Mill looks like a solid, cylindrical block of chocolate. In reality, it's ten-layers thick. As a a crank-turned blade shaves wafers of chocolate from the top, the underlying layers, each one flavored with a unique pattern of chocolate shapes, is revealed.

# Celebrating Jean-Félix Picard's Birthday With Geodetic Trivia

If you find having a favourite map projection a delightfully geeky quirk, you're going to want to raise a toast in honour of Jean-Félix Picard. Geodetics and cartography owe a debt of gratitude to the 17th century scientist who made the first accurate measurement of the Earth's size.

# A Massive Crop Circle Appeared Overnight In Italy

An intricate crop circle, pictured here, materialized last night in Poirino, Italy. This aerial view gives you a good sense of scale. See those cars in the upper left hand corner? Yeah. This thing's a biggie.

# A Globe Can Help You Understand How Space Can Be Curved

There are theories out there that space itself can be curved. This is a confusing idea for some people. A quick exercise with a globe can make it a little more understandable.

# Space-Pi!

Pi is for planets, and spacecraft, for orbital dynamics and craters. It's 3.14, and it's all about circles.

# After 400 years, mathematicians have found a new class of solid shapes

The work of the Greek polymath Plato has kept millions of people busy for millennia. A few among them have been mathematicians who have obsessed about Platonic solids, a class of geometric forms that are highly regular and are commonly found in nature.

# Geometric sand sculptures put your bucket-and-trowel creations to shame

The cubist creations of sandcastle artist Calvin Seibert will blow you away.

# I can't stop watching this door open & close

Add this to the list of things we never knew existed but now desperately need: The Evolution Door, a "flip-panel" invention by Austrian designer Klemens Torggler.

# All I want for Christmas are these badass Euclidian sculptures

From London-based "paper engineer" (paper engineer!) Helen Friel comes this creative collection of colorful folding geometric designs. The name of the collection? "Here's looking at Euclid." GEOMETRY PUNS! We must have these.

# How To: Make geometric models out of straws and coffee stirrers

Over at Make Magazine, Iann Gonsher shares this remarkably simple (not to mention totally free, if you count your latte as admission) method for building cool geometric models. "The baristas don’t tend to mind," he writes, "especially if you tip generously."

# A beautiful global map, created with a spirograph

Above is one in a series of world maps created by artist Rachel Evans using nothing more than a spirograph, the mesmerizing geometric drawing tool of your childhood.

# What does a heart's sine function look like?

In high school, you probably learned that trigonometric functions – like sine, cosine and tangent –can be derived, geometrically, from a circle (hence why trig functions are also known as "circular" functions). But what happens if you use a square to derive these functions, instead? Or a triangle? Or a heart?