Describes the life and work of Eratosthenes, the Greek geographer and astronomer who accurately measured the circumference of the Earth.

In 1714, England's Parliament offered a huge reward to anyone whose method of measuring longitude could be proven successful. The scientific establishment--from Galileo to Sir Isaac Newton--had mapped the heavens in its certainty of a celestial answer. In stark contrast, one man, John Harrison, dared to imagine a mechanical solution--a clock that would keep precise time at sea, something no clock had been able to do on land. And the race was on.......

Offers a visual guide, with brief explanatory text, to comparative sizes, heights, weights, and numbers in such areas as capacity, population, growth, weather, disasters, speed, and others.

Is baking basic chemistry? Are ingredients basic biology? And is cooking basic math? If you can't tell a tsp from a TBL, you're likely to get a pancake when you wanted a souffle. Basic math is needed to help you properly prepare a recipe your guests will enjoy, or to change your favorite recipe to serving ten people instead of four. Matt the Mathematical Cook is a lively host who will multiply, divide, measure and whip up a few recipes in the process....

What are the features of a school change model? Can these characteristics be captured and shared with other schools? How can all members of the school community work together to effect change? In this four-part series, teachers and administrators explore specific ideas for implementing an apprenticeship literacy model that includes on-the-job experiences in five critical areas: assessing change over time in reading and writing progress colleague coaching...

Examines the concept and measure of time before the establishment of Standard Time in 1884, and chronicles Sandford Fleming's struggle to make the world see the need for such a system.

The U.S Department of Energy reports that 20% of our electric bills come from items that are left plugged in when they are not in use, or items that are in standby mode. With the Kill A Watt P4400 we can monitor the energy eaters in our homes and cut down our electric bills at the same time. Plug whatever item you want into the device and it will tell you the efficiency of that item by displaying the kilowatt per hour. This device will help you determine...