Though plasma's all around us in the universe, we live in a relatively cold environment, so natural plasma is rare on Earth. Plasmas are often used in industry to make micro-electronics. Engineers make artificial plasma to conduct electricity in neon signs and fluorescent bulbs. Right now, scientists working on fusion - a cheap energy source for the future - are experimenting with plasma in the lab. Someday, plasma fuel might power our planet Scientists work with super-hot plasmas inside this reactor where temperatures can soar to 100 million degrees! Research into fusion, the energy that powers the Sun, may yield clean fuel for the future.