What is the longest recorded attack of hiccuping, sneezing, or yawning?
The longest hiccuping attack lasted 65 years.
The longest sneezing fit lasted 978 days.
The longest yawning ordeal took five weeks.
Plastics are only one kind of polymer, a substance composed of very large chain-like molecules that consist of smaller, repeating chemical units. Natural polymers include proteins, cellulose, diamonds, and quartz. Besides plastics, man-made ones include concrete, glass, and paper.
Yes, at least since 1800. At that time, Philadelphia and Baltimore were the second and third-largest cities. Census estimates for 1986 placed Los Angeles and Chicago, respectively, in those ranks.
Dinosaurs lived during the Mesozoic era, 225 million to 65 million years ago. By the end of that era, all Archosauria (or “ruling reptiles”), except crocodiles, had died.
In a blind test of a new drug, the subject does not know if he or she is receiving the drug or a placebo, but the physician administering the test does know. In a double-blind test, neither the subject nor the physician knows.
The continental shelf is an underwater ledge around the coastline of the world’s oceans. The edge of the shelf lies at depths of between 360 and 480 feet. The width may vary from a few feet to several hundred miles.
The light from a firefly comes from an area on the sides of its stomach. Fatty tissue located there contains air tubes and nerves that when stimulated give off oxygen. The oxygen combines with a pigment in the fat called luciferin, producing the familiar heatless light.