when was smoking first known to be harmful
History of smoking Early 17th century descriptive notices of various characteristic types and fashions of men portray tobacconists and smokers as individuals who suffer from false self-images and mistaken illusions about the properties of tobacco taking.[26] Though physicians such as Benjamin Rush claimed tobacco use (including smoking) negatively impacted health as far back as 1798,[27] not until the early 20th century did researchers begin to conduct serious medical studies.
Economic nationalism While the coining of the term "
Bull riding The flank strap
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
All that glitters is not gold While early expressions of the idea are known from at least the 12th century, the current saying is derived from a 16th century line by William Shakespeare.
Standard deviation Let X be a random variable with mean value Î¼: