The normal PaCO2 (arterial partial pressure of carbon dioxide in the blood) is 40mmHg.he normal PaCO2 (arterial partial pressure of carbon dioxide in the blood) is 40mmHg.
Highlights for Children, often referred to simply as Highlights, is an American children's magazine. It began publication in June 1946, started by Garry Cleveland Myers and his wife Caroline Clark Myers in Honesdale, Pennsylvania (the present location of its editorial office). They both worked for another children's magazine, Children's Activities, for 12 years before leaving to start Highlights.
In the first issue of Scientific American: Centrifuges and levitating haystacks. Scientific American, the oldest continuously published magazine in America, began life on August 28, 1845 as a 4-page, black and white newsletter. There were only a couple of illustrations.