Pill packages have active pills (with hormones) and placebo pills (no hormones). The number of placebo pills can vary depending on the type of pill used. Your menstrual period should occur during the placebo pills due to lack of hormones. You are still protected from pregnancy during the placebo pills.
Making the Case against the biting midge: evidence is building that the biting midge, Culicoides sonorensis, is a vector of vesicular stomatitis virus (VSV), which causes significant economic losses in cattle, horses, and swine.
VSEPR stands for Valence Shell Electron Pair Repulsion, which is a theory that chemists use to predict the shape and bond angles of different molecules. VSPER is pronounced ves-per in everyday use. Basically, the theory says that the valence electron pairs around an atom repel each other mutually.