The radio was promoted and popularized by Guglielmo Marconi in 1895. RIA revolutionized diagnoses because it used only a tiny sample of blood or tissue and is a relatively inexpensive and simple test to perform. A radio telescope is a metal dish that gathers radio waves from space. Radio astronomy involves exploring space by examining radio waves from outer space. Radio astronomy was pioneered by Karl G. Jansky , who in 1932 first detected radio waves from a cosmic source - in the central region of the Milky Way Galaxy .
Rayon is used as a substitute for silk.
The Razor scooter is a new and very popular foldable scooter. It took about 5 years for the team to develop their current model, which uses airplane-grade aluminum and polyurethane wheels. It was introduced in 1998 at the NSGA World Sports Expo, when Tsai scooted around the show, attracting the attention of Sharper Image Corp., who ordered the first Razor scooters. The scooters quickly became popular world-wide. Early records were cylindrical, but flat disks soon replaced them.