Unusually warm waters in the Pacific Ocean, near the equator, tend to increase rainfall. This can cause flooding and even drought throughout the globe. This phenomena is called El Nino. The U.S. National...

Mark Zuckerberg launched Facebook in February 2004. It currently serves approximately 1 billion users. Twitter, founded by Jack Dorsey in 2006, provides for 500 million users. Aside from the logistics,...