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The Age and Composition of the Universe

In one of the most important cosmological discoveries in years, NASA scientists have captured the most precise image of the universe, shedding light on its origins, age, and providing further…

Neither Fish nor Tetrapod

Neither Fish nor Tetrapod Several times a year popular science articles breathlessly announce the discovery of a “missing link,” but in the case of the recently identified fossils of an odd…

Back to School Center

  Calculate Distance Latitude and Longitude Roman Numeral Challenge Spelling Challenge Conversion Calculator Word Quiz: preparatory Periodic Table…

Back to School Center

Calculate Distance Latitude and Longitude Roman Numeral Challenge Spelling Challenge Conversion Calculator Word Quiz: preparatory Periodic…

Roadside Attractions in America

Going on a road trip? The St. Louis Arch, Statue of Liberty and Golden Gate Bridge are great tourist sites. But if you prefer offbeat destinations, check out these roadside attractions and odd…

Best-Selling Children's Books, 2005

Source: Publishers Weekly.HardcoverHarry Potter and the Half-Blood Prince, J. K. RowlingThe Penultimate Peril (A Series of Unfortunate Events #12), Lemony Snicket, illustrated by Brett…

Animal Groups

Vertebrates and Invertebrates Warm-blooded animals regulate their own body temperatures; their bodies use energy to maintain a constant temperature. Cold-blooded animals depend on their…

Top 10 Movies of 2009

This table lists the top-grossing movies of 2009. Transformers: Revenge of the Fallen made the most money in the United States in 2009. Rank Title Total Gross 1. Transformers: Revenge…

Paleocene epoch

(Encyclopedia) Paleocene epochPaleocene epochpāˈlēəsēnˌ [key], first epoch of the Tertiary period in the Cenozoic era of geologic time (see geologic timescale) between 60 to 66 million years ago. In…

pterosaur

(Encyclopedia) pterosaurpterosaurtĕrˈəsôrˌ [key] [Gr., = winged lizard], extinct flying reptile (commonly called pterodactyl [Gr., = wing finger]) of the order Pterosauria, common in the late…