An enzyme is a catalyst that helps to speed up the rate of a reaction by lowering the activation energy of a reaction. There are many enzymes in the human body, without which lots of important reactions would never take place. Cellular respiration is one example of a reaction that is catalysed by enzymes.
Sullivan Act Tim Sullivan, a major Irish criminal passed the Sullivan Act in 1911 to help his constituents rob strangers or to help them against Italian incomers. That is the crux of story that goes with a very early gun control law.
On 9 February, 1963 [sic], for example, they almost literally stopped America. When they appeared on the Ed Sullivan Show, 73 million people watched. As John Lennon later pointed out, even the criminals stayed home. And indeed, for that one sweet, manic hour, there was hardly any crime in the United States.