Gigahertz, generally abbreviated GHz, refers to frequencies in the billions of cycles per second range. Giga is the standard multiplier for 1 billion, and Hertz is the standard unit for measuring frequencies, expressed as cycles or occurrences per second. One GHz is equivalent to 1,000 megahertz . Most commonly, gigahertz is used when discussing computer performance or radio frequencies. In computers, it most often refers to the clock speed of the central processing unit ; the faster the CPU clock can tick, the faster, in general, the computer can process data and instructions.
In Italy, France, Belgium, and French-speaking areas of Switzerland and Canada, 1 April tradition is often known as April fish (poissons d'avril in French or pesce d'aprile in Italian).This includes attempting to attach a paper fish to the victim's back without being noticed.ome precursors of April Fools' Day include the Roman festival of Hilaria, the Holi festival of India, and the Medieval Feast of Fools. In Chaucer's Canterbury Tales (1392), the  Nun's Priest's Tale  is set Syn March bigan thritty dayes and two.
Others have suggested that the timing of the day may be related to the vernal equinox (March 21), a time when people are fooled by sudden changes in the weather. There are variations between countries in the celebration of April Foolsâ Day, but all have in common an excuse to make someone play the fool. In France, for example, the fooled person is called poisson dâavril (âApril fishâ), perhaps in reference to a young fish and hence to one that is easily caught; it is common for French children to pin a paper fish to the backs of unsuspecting friends.