Argon is used to fill the space in most light bulbs. Neon is used in fluorescent signs. Fluorescent lights are filled with mercury gas.
Speed of Radio Waves
Radio waves travel so much faster than sound waves that a broadcast voice can be heard sooner 18,000 km away than in the back of the room in which it originated.
More Science Facts
The smallest transistor is 50-nanometres wide - roughly 1/2000 the width of a human hair.
An atomic clock is accurate to within 1 second in 1,7 million years.