Wolfram|Alpha: Computational Knowledge Engine

Free online access to the Wolfram|Alpha computational knowledge engine:

answer questions; do math; instantly get facts, calculators, unit conversions, and real-time quantitative data and statistics; create plots and visualizations; and access vast scientific, technical, chemical, medical, health, business, financial, weather, geographic, dictionary, calendar, reference, and general knowledge—and much more.

via Wolfram|Alpha: Computational Knowledge Engine.

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