Intelligence and creativity

John Raven

Intelligence Journal

Psychometrics Centre

Item Response Theory

MIT Center for Collective Intelligence

Jonathan Wai - Finding the Next Einstein

Human Intelligence

The World Genius Directory

Brain Pickings

The Creativity Post

Puzzles and games

Chinese puzzles

Flexagons

NYTimes Wordplay

Puzzleboxworld.com

Sam Loyd

2048

Nerdy but fun stuff

Periodic table table

Numberphile

Escher wooden floor lizards

ThinkGeek

ILOVESCIENCESTORE

Gömböc

xkdc

PHD Comics

The Straight Dope

Hexmasters Faktoider (in Swedish)