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.
Immediate release Ritalin, which contains the drug called methylphenidate, lasts for three to six hours, typically peaking at approximately two hours after dosing. According to the Family Practice Notebook, the length of time methylphenidate's effects last depend on the formulation in which it is delivered.