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Software

Google's math

Google on Tuesday added a feature to its popular search tool that allows visitors to calculate mathematical equations. It can compute basic arithmetic like 15*5+2, more complicated equations and measuring unit conversions like 200 miles in kilometers. Still, Google's calculator lags other rival services, including Overture-owned AlltheWeb.com, which has offered similar capabilities for months.

Mountain View, Calif.-based Google also introduced a tested version of its new toolbar, which lets people block pop-up ads or automatically fill in online forms.