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Great site with many articles related to health, safety and fitness. The site is available in Spanish. Many articles can be downloaded in MP3 format. A built in screen reader (that highlights) makes this an excellent site as it models many UDL principles.

Free powerful online 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.