Human beings are everywhere. With settlements on every continent, we can be found in the most isolated corners of Earth’s jungles, oceans and tundras. Our impact is so profound, most scientists believe humanity has left a permanent mark on Earth’s geological record. So what would happen if suddenly, every human on Earth disappeared? Dan Kwartler investigates. Here are some questions related to the video: 1. How long would the underground rail systems flood when the drainage bumps a

Thomas Suarez's interest in technology and programming led him to learn Python, Java, and C “just to get the basics down.” He built an app and then coaxed his parents into paying the $99 fee to get his app, Earth Fortune, in the app store. Thomas also started an app club at school to help other kids build and share their creations, and is now starting his own company, CarrotCorp.

Since their emergence over 200,000 years ago, modern humans have established communities all over the planet. But they didn’t do it alone. Whatever corner of the globe you find humans in today, you’re likely to find another species as well: dogs. So how did one of our oldest rivals, the wolf, evolve into man’s best friend?  "Given enough time, even our most dangerous rivals can become our fiercest friends." Now test your knowledge after watching this video by answering these que