Search engine - with readability built in
"Twurdy uses text analysis software to "read" each page before it is displayed in the results. Then Twurdy gives each page a readability level. Twurdy then shows the readability level of the page along with a color coded system to help users determine how easy the page will be to understand."
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British Museum's web site on ancient Egypt. The areas explored are: Egyptian Life, Geography, Gods and Goddesses, Mummification, Pharaoh Pyramids, Temples, Time, Trades and Writing.
The Common Core State Standards focus on core conceptual understandings and procedures starting in the early grades, thus enabling teachers to take the time needed to teach core concepts and procedures well—and to give students the opportunity to master them.