Library of Congress Photo Archives is a site every teacher should bookmark. With over 1.2 millions images in this database, your students can certainly gather a wide variety of images for their history projects. Each image has different licensing, so look closely. Supporting units: famous Americans, presidents, civil rights, wars, inventors, authors, and just about any historical American event
worth noting for volume of Twitter posts following 2011 tsunami in Japan, use of Twitter following phone outages, and sharing expected arrival time of waves in US before official government announcements
forecasters have little ability to predict how intense future El Niño episodes will be. According to the National Oceanic and Atmospheric Administration (NOAA) it is also near impossible to pinpoint the exact dates that El Niño will begin.