Other ignition sources may be mentioned.

(vi) potential ignition sources (including electrical equipment).

A hundred years ago, it's certainly true that to drive a car you kind of needed to know a lot about the mechanics of the car and how the ignition timing worked and all sorts of things.

Other designs are emerging to join the race for fusion power. Lawrence Livermore National Laboratory s National Ignition Facility in California is getting impressive results by firing high powered lasers at capsules of fuel, crushing the particles together to trigger fusion reactions.

At the Mayak Industrial Reprocessing Complex in Russia s southern Urals, a storage tank holding nitrate acetate salts exploded in 1957, releasing a massive amount of radioactive material over 20,000 square kilometers, forcing the evacuation of 272,000 people. In September 1994, an explosion at Indonesia s Serpong research reactor was triggered by the ignition of methane gas that had seeped from a storage room and exploded when a worker lit a cigarette.