Nominated by Hassan Masum

Feast on the Khan Academy educational smorgasbord of 10-minute videos. Insightful and to the point, the vast collection at Khan Academy illustrates what one persistent individual can accomplish - and how to design online learning to be both useful and fun.

Hassan Masum is a Senior Research Analyst at the McLaughlin-Rotman Centre for Global Health and a regular Worldchanging Correspondent.

Editor's Note: This piece is part of Worldchanging's Attention Philanthropy campaign. All week long, the Worldchanging Network will be delivering "attention grants" to worthy projects, individuals, resources and more. You can learn more about these gifts of notice and find other entries by clicking here.