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George Lane (born 1964) is a British mental calculator and author. He is a five-time gold medalist in the Mental Calculations event at the annual Mind Sports Olympiad , [1] [2] and is one of only five Grandmasters of Mental Calculation, [3] as recognised by the Mind Sports Organisation .
Solar-powered calculators are hand-held electronic calculators powered by solar cells mounted on the device. [1] They were introduced at the end of the 1970s. [2]Amorphous silicon has been used as a photovoltaic solar cell material for devices which require very little power, such as pocket calculators, because their lower performance compared to conventional crystalline silicon solar cells is ...
The Mercedes-Euklid is a German-invented calculator from the early twentieth century. It was built by Mercedes Büro-Maschinen Werke AG in Thuringia , Germany in 1905. The first manual mechanical models utilized a proportional-lever design invented by Christel Hamann in 1903.
The Calculator-Based Laboratory (CBL) is a mobile data collection device manufactured by Texas Instruments in collaboration with Vernier Software & Technology and introduced in 1994. The CBL can be used to collect data either in conjunction with a TI graphing calculator , or on its own.
A mental calculator or human calculator is a person with a prodigious ability in some area of mental calculation (such as adding, subtracting, multiplying or dividing large numbers). In 2005, a group of researchers led by Michael W. O'Boyle, an American psychologist previously working in Australia and now at Texas Tech University , has used MRI ...
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