Harvard Online
Principles of Biochemistry
HarvardX course on the molecules of life, enzymes and metabolic pathways.
HarvardX course on reading the sky and forecasting tomorrow's weather from your own observations.
Taught byHarvard OnlineProfessor John Huth explains the physics of air, water and wind in weather systems and teaches practical skills such as identifying clouds, estimating local winds and making next-day forecasts from observations.
Best for: Outdoor enthusiasts and beginners curious about weather and climate.
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Free to audit on edX; the verified certificate costs $149.
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Harvard's open catalogue, including CS50.
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