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Paul Erdős and 10-year-old Terence Tao, 1985. One of the greatest minds meeting one of the greatest minds-to-be.

Galileo’s drawings of the Moon, 1610. The first realistic images in history.

How to construct a perfect regular pentagon. No numbers. No protractor. Just a straight edge and a compass.

Today I learned that the FBI spent decades tracking mathematician Paul Erdős, only to conclude that the guy was just really into math. muckrock.com/news/archives/…

Original sketch of the Radium atom by Niels Bohr (1922).

The beauty of math book covers from Dover Publications. 😍

In 1687, Newton published Principia Mathematica. Motion, gravity, calculus—written in ink. Here’s the original copy, annotated by Newton himself: cudl.lib.cam.ac.uk/view/PR-ADV-B-…

If you write the numbers from 82 to 1 in descending order, you will get a 155-digit prime number. 😮

The simplest way to visualize the set of numbers. Utterly useful diagram!❤️ [bit.ly/3hETqNE]

The geometry behind parallel parking.

Fourier Series of Square Wave. [bityl.co/O18b]

Each of the white circles are really just moving back and forth along a straight line. [bit.ly/4ktSxFK]

Math family.

Golden Ratio Biscuit Cutter. For mathematically perfect bakes—literally.

A site dedicated to animated knots. 100s of knots. All animated. All useful. animatedknots.com

The beautiful proof of why √2 ∉ Q 😲

This geometry gif shows what the “polygonal sine” looks like for the square and the hexagon. [bityl.co/Hphu]

The beautiful geometry of Budapest's staircases. They are like time machines. behance.net/gallery/847955…

126 ways to sew on a four-hole button.