Still in their coats on a sunny day(Thanks to [seattle + beyond]) To see what a difference it makes whether sunlight hits the Earth directly or at an angle, just think about a sunny day in summer and [...]
People driving cars in the rain Some of the tiny particles inside the clouds - the cloud seeds - are made of pollution from cars and factories. They're little particles [...]
The Sun shining from space: nuclear fusion in action. The first fusion reactions Fusion reactions are how the first stars got started. Soon after the Big Bang, hydrogen atoms began bumping into each other and [...]
What is heat? A big campfire throws some serious heat Definition of heat When molecules of any kind of atoms get more energy in them than they had before, they [...]
