Other viruses that can cause colds include coronavirus, respiratory syncytial virus, influenza and parainfluenza. Colds cause a lot of people to stay home. The CDC says 22 million school days are lost each year in the U.S. because of them. Some estimates say that Americans have 1 billion colds a year. For more detail, see Common Cold Causes. How a Common Cold Starts. You can catch it from another person who is infected with the virus. This can happen by direct physical contact with someone who has a cold, or by touching a surface contaminated with their germs -- like a computer keyboard, doorknob or spoon --- and then touching your nose or mouth.
The hypocaust system. The hypocaust system (hypocaustum in Latin) was a heating system used in (wealthy) Roman homes and Roman baths, and the closest thing to central heating today. The hypocaust was a system that circulated hot air under the floor and surrounding walls. Hypocaust construction
Gladius (Latin: glÄdÄ­us) was one Latin word for sword and is used to represent the primary sword of Ancient Roman foot soldiers. Early ancient Roman swords were similar to those used by the Greeks.From the 3rd century BC, the Romans adopted swords similar to those used by the Celtiberians and others during the early part of the conquest of Hispania. This sword was known as the Gladius Hispaniensis, or  Hispanic Sword.he sword was 58 cm (23 in) long. The Chiusian sword was created from a single bloom by forging from a temperature of 1237 Â°C. The carbon content increased from 0.05â0.08% at the back side of the sword to 0.35â0.4% on the blade, from which the authors deduce some form of carburization may have been used.