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What does 50 pack year history mean?
smoked 1 pack of cigarrettes a day for last 50 yrs.Actually it's a little more complicated than what is answered above. Pack-years are calculated by multiplying the number of packs of cigarettes smoked per day by the number of years the person has smoked.A pack-year is smoking 20 cigarettes a day for one year. If someone has smoked 10 cigarettes a day for 6 years, they would have a 3-pack-year history. Someone who has smoked 40 cigarettes daily for 20 years has a 40-pack-year history.So it is actually possible for someone to have a pack-year history that is larger than their actual age.
What is the national history day theme?
The National History Day theme this year is: INNOVATION IN HISTORY: IMPACT AND CHANGE
Are there more quotes about history?
There are a lot of quotes about history:"History keeps repeating itself because nobody listens."~unknown"History is a pack of lies about events that never happened told by people who weren't there."~George Santayana"A historian is often only a journalist facing backwards."Karl Kraus
What year did you s history start?
started when i wasborn
Why is 1792 an important year in the history of the NYSE?
cuz their was more money made
