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 [Discover] Interactivate: Estimator http://www.shodor.org/interactivate/activities/Estimator/?version=1.5.0_06&browser=MSIE&vend ... (math estimating estimation)
 [Discover] Web Development Project Estimator http://estimator.astuteo.com/ (webdesign useful webdev tool)
 [Discover] Unbiased estimator for population variance http://www.uvm.edu/~dhowell/SeeingStatisticsApplets/N-1.html (math statistics teaching)
 [Discover] Federal Tax Estimator http://www.1040.com/site/ToolCenter/CalculatorsEstimators/tabid/227/Default.aspx (calculator government)
 [Discover] Calories Burned Estimator http://www.healthstatus.com/calculate/cbc (weightloss tool weight tools)
 [Discover] TurboTax Estimated Taxes https://www.estimatedtaxes.com/Estimator/welcome.do (taxes)
 [Discover] Journal / Author Name Estimator http://biosemantics.org/jane/ (papers journal journals publishing)
 [Discover] RepairPal http://repairpal.com/estimator (car repair)
 [Discover] High Tech Startup Valuation Estimator http://www.caycon.com/valuation.php#bottom (vc business angels investors)
 [Discover] Google AdWords : 点击量估算工具 https://adwords.google.com/select/TrafficEstimatorSandbox (adwords traffic estimator tools)

 [Discover] The FICO® Score Estimator http://www.bankrate.com/brm/fico/calc.asp (finance fico tools money)