Toxic air pollutants are poisonous substances in the air that come from natural sources (for example, radon gas coming up from the ground) or from manmade sources (for example, chemical compounds given off by factory smokestacks) and can harm the environment or your health.
Subsequently, Scorpius X-1 was discovered in 1962 by a team, under Riccardo Giacconi, who launched an Aerobee 150 sounding rocket carrying a highly sensitive soft X-ray detector designed by Frank Paolini.
Basilosaurus (king lizard) is a genus of prehistoric cetacean that existed during the Late Eocene, 30 to 40 million years ago (mya). The first fossil of B. cetoides was discovered in the United States and was initially believed to be some sort of reptile, hence the suffix -saurus, but it was later found to be a marine mammal.