200 countries over 200 years in 4 minutes. I love Hans Rosling.The Mandelbulb
Discussion and beautiful pictures of the Mandelbulb, a 3D analog of the Mandelbrot set.Math subreddit
Interesting math links from the popular social news site.Polynomial roots
High-resolution plots of the roots of all polynomials of degree 24 of a certain form. Incredible patterns emerge.Proof Wiki
Online compendium of mathematical proofs.Mathematical surprises
A list of unexpected results.Math Overflow
Online community of mathematicians.Mathbin.net
A LaTeX capable pastebin.Mudd Math Fun Facts
A great collection of interesting topics to enrich courses.$25,000,000,000 Eigenvector
The linear algebra behind Google
Pitch Drop Experiment
The world's longest continuously running lab experiment.Morpho Towers video
Awesome ferrofluid sculpture.Popping Bubbles
Fantastic photo of bubbles bursting into droplets (check out the rest of his series).Science subreddit
Interesting science links from the popular social news site.PhysOrg.com
Physics news.Bullet impacts
1 million fps video of bullet impacts. Too cool.The Messenger Lectures
Feynman's famous Cornell lectures on physics.
I dare you to find a better webcomic featuring velociraptors and mathematics.PHD Comics
Ahh...grad students.Neave Strobe
From zero to hallucinations in 30 seconds.Twiddla.com
Amongst other features, you can collaborate on a real-time whiteboard.Illustrated guide to a Ph.D.
I like it. Especially the last picture.Delightful puzzles
Some great logic puzzles here.