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How the geometry of a molecule plays into aromaticity. Why cyclooctatetraene is not aromatic like benzene. Organic chemistry Sal and Jay co…

Using the Hardy-Weinberg equation to calculate allele and genotype frequencies. Biology Life is beautiful! From atoms to cells, from genes …

Overview of how chromosomes were first proposed as the carriers of Mendel's "heritable factors" (what we now call "genes"). Biology Life is…

Structure of the Earth - crust, mantle, core Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy,…

The halogenation of benzene. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of…

Geological features of Convergent Plate Boundaries Cosmology and astronomy It's a great, big universe out there. In this section of Khan Ac…

Hydrocarbon overview. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is th…

Seeing how a noncompetitive inhibitor can bind whether or not the substrate is bound, and vice versa. Biology Life is beautiful! From atoms…

Amino acids and the central dogma of molecular biology. Amino and carboxyl groups, side chains, and zwitterions. Biology Life is beautiful!…

Demonstrating that voltage is an intensive property by calculating the voltage and change in Gibbs free energy for a half reaction. Chemist…

An overview of early development of a zygote to an embryo. Embryonic and somatic stem cells. Biology Life is beautiful! From atoms to cells…

Explains where f block fits in in the periodic table, and the n-2 rule. Introduces shorthand notation to get e configuration of Nd based on…

Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

The Second Law of Thermodynamics: there can be no spontaneous transfer of heat from cold to hot. Chemistry Did you know that everything is …