Mine safety in coal mines, which in turn can initiate more extensive coal dust explosions. For this reason, rock dusts such as limestone dust are spread throughout coal mines to diminish the chances of coal dust explosions as well as to limit the extent of potential explosions, in a process known as rock dusting. Coal dust explosions can also begin independently of methane gas explosions. Frictional heat and sparks generated by mining equipment can ignite both methane gas and coal dust. For this reason, water is often used to cool rock-cutting sites. Miners utilize equipment strong enough to break through extremely hard
There once was a man from Nantucket There once was a man from Nantucket "There once was a man from Nantucket" is the opening line for many limericks, in which the name of the island of Nantucket creates rhymes and puns, often obscene. The protagonist in the obscene versions is typically portrayed as well-endowed and hypersexualized. The opening line is so well known that it has been used as a stand-alone joke, implying upcoming obscenities. The earliest published version appeared in 1902 in the "Princeton Tiger" written by Prof. Dayton Voorhees: Other publications seized upon the "Nantucket" motif, spawning many sequels Among the most well known are: