In the first decade of the 20th century, Einstein produced the theory of the conversion of mass into energy, E=mC(2), which was confirmed by laboratory observations. A new theory of the atom was devised by the English physicist Rutherford in 1913.
Methylphenidate, Methylin. Generic Ritalin. Methylphenidate (methylin) is a moderately priced drug used to treat attention-deficit hyperactivity disorder (ADHD). It is also used to treat narcolepsy. This drug is slightly more popular than comparable drugs. It is available in brand and generic versions.
Ritalin: A Controlled Substance. RitalinÂ® (methylphenidate hydrochloride) is a prescription medication that is classified as a controlled substance. Longer-acting forms of the drug (Ritalin SRÂ® and Ritalin LAÂ®) are also available (and are also controlled substances).