26:06From the PhD Lab: How do biofilms help keep bacteria alive? - with Josh Horton
The Royal Institution
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/basic-economics-concepts-macro/production-possibilities-curve-scarcity-choice-and-opportunity-cost-macro/v/opportunity-cost Opportunity cost (and marginal cost) based on the PPF More free lessons at: http://www.khanacademy.org/video?v=pkEiHZAtoro
Published 2011-12-29 · Watch on YouTube ↗
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