The earliest chemical symbols were devised by alchemists, who often used and adapted the rich symbolism of astrology. For example, in Etienne Geoffroy's (1672-1731) table of chemical affinities, published in 1718, the astrological symbol for Mars is...

A chemical symbol is an abbreviation or short representation of the name of a chemical element, generally assigned in relation to its Latin name. Natural elements all have symbols of one or two letters; some man-made elements have temporary symbols of...

Looking for a contraceptive that's convenient _ and tasty? The first chewable birth-control method, a tiny, spearmint-flavored tablet that also can be swallowed without chewing, has hit pharmacy shelves.Femcon Fe, which contains the same hormones as standard oral contraceptives, offers a new option for women...

In a Dec. 7 story about oral contraceptives, The Associated Press misspelled an ingredient in Femcon Fe, a chewable contraceptive tablet made by Warner Chilcott. The ingredient is ethinyl estradiol, not ethanol estradiol. The corrected story is below.___TRENTON, N.J. (AP) _ Looking for a contraceptive...

Looking for a contraceptive that's convenient _ and tasty? The first chewable birth-control method, a tiny, spearmint-flavored tablet that also can be swallowed without chewing, has hit pharmacy shelves.Femcon Fe, which contains the same hormones as standard oral contraceptives, offers a new option for women...