Why We Vomit. In many cases, throwing up is a protective reflex to rid your body of viruses, bacteria, or parasites in your digestive system. âIf you were to eat something that was spoiled or poisoned, your body would get a signal that something was wrong,â says Bruno Chumpitazi, MD, of Texas Childrenâs Hospital.
Parafilm is ideal for the scientific laboratory because it is a thermoplastic, self-sealing film. It holds moisture loss to a minimum. It offers excellent protection for the contents of tubes, flasks, and petri dishes.
Sources for Public Domain Footage. NARA has an extensive collection of films created for and produced by the U.S. government that are in the public domain, including military films, educational and documentary films (1915-1976). NARA also has gift materials from private sources, such as Universal Newsreel releases and outtakes (1929-67).