## Excel in math and science

### Master concepts by solving fun, challenging problems.

## It’s hard to learn from lectures and videos

### Learn more effectively through short, conceptual quizzes.

## Our wiki is made for math and science

###
Master advanced concepts through explanations,

examples, and problems from the community.

## Used and loved by 4 million people

###
Learn from a vibrant community of students and enthusiasts,

including olympiad champions, researchers, and professionals.

## Comments

Sort by:

TopNewestApr. 16, 2013 — Camping in the backcountry may never be the same.

Power Practical, a student startup that sprang from research at the University of Utah, is selling a portable cook pot that transforms heat and water into a power source. Imagine charging your cellphone or using speakers in the mountains at night far from civilization. That's what the device, called the PowerPot, can do with just a campfire and a little water. Using thermoelectricity, the PowerPot generates power by capturing the electrons moving from the heated pot to the cooler water inside. The greater the temperature difference, the more electricity is generated. – N K · 3 years, 9 months ago

Log in to reply

awesum....:) – Riya Gupta · 3 years, 9 months ago

Log in to reply

Great ! – Shaheed Vh · 3 years, 9 months ago

Log in to reply