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An illustrated history of timekeeping from ancient times to the present, the Evolution of Time Measurement: Early Calendars, Early Clocks, Revolution in Timekeeping, the Atomic Age, World Time Scales, and NIST Time Calibration. Full Review »
More than 30 Federal agencies formed a working group in 1997 to make hundreds of Federally supported teaching and learning resources easier to find. The result of that work is the FREE web site. For an overview of what's available here at FREE, please vis Full Review »
Scientists at Fermilab carry out research in high-energy physics to answer the questions: What is the universe made of? How does it work? Where did it come from? Full Review »
Physical Statistics: Harbor porpoise are the smallest cetacean species found in this area, reaching only 4-5 feet in length and weighing up to 140 pounds. Field Marks: Harbor porpoise are the only true porpoise in the North Atlantic. Unlike dolphins, porp Full Review »
These striking lemurs inhabit the rainforests of Madagascar. Physical Description V.v.variegata has variable patches of black on a white body. V.v.rubra has mostly red fur with a black crown and a white nape. Distribution Ruffed lemurs inhabit eastern M Full Review »
A Prosimian is a premonkey or protomonkey. They are small insectivore-like mammals that exhibit some characteristics of monkeys. They have special behavioral and physical adaptations to fill different ecological niches. Prosimians can be diurnal?, but the Full Review »
If you look in the records there is a lot of controversy over which snake holds the world's record for massive size. The dimensions that have earned the anaconda the title of king is its total body mass or its weight (the sheer physical bulk of it). The o Full Review »
Desert plants have adapted to the extremes of heat and aridity by using both physical and behavioral mechanisms, much like desert animals. Full Review »
You are invited to submit questions on microgravity (weightlessness) and its effects on physical (but not biological) phenomena to the Microgravity Science Division at the NASA Glenn Research Center, in Cleveland, Ohio. Questions about the effects of micr Full Review »
High quality instructional materials, software, and hardware for physical education. Featuring the Using Technology in Physical Education Newsletter read monthly by over 55,000 physical educators. Full Review »
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