Benign paroxysmal positional vertigo (BPPV) causes a whirling, spinning sensation even though you are not moving. If the vertigo is bad, it may also cause nausea or vomiting. The vertigo attacks happen when you move your head in a certain way, such as tilting it back or up or down, or by rolling over in bed. It usually lasts less than a minute. Moving your head to the same position again may trigger another episode of vertigo.
There are more carbon compounds than there are compounds of all other elements combined. The study of carbon compounds, both natural and synthetic, is called organic chemistry. Plastics, foods, textiles, and many other common substances contain carbon.
carbon carÂ·bon (kÃ¤r'bÉn) n. Symbol C A nonmetallic element occuring in many inorganic and in all organic compounds, existing as graphite and diamond and as a constituent of coal, limestone, and petroleum, and capable of chemical self-bonding to form a number of important molecules.