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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 …

Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the brain-bending vastnes…

How to name benzene derivatives, with examples. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Bas…

VSEPR for molecules with four electron clouds including examples for tetrahedral, trigonal pyramidal, and bent molecules. Chemistry Did you…

Getting an intuitive understanding of buffers using le Chatelier's principle. Derivation of the Henderson-Hasselbalch equation. Chemistry D…

Evaporative cooling. Why sweating cools you down. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations …

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

Carboxylic acids are named following IUPAC nomenclature. In general, carboxylic acids are named based on the number of carbons in the longe…

This video introduces the structure and structural types of neurons. By Matt Jensen. Health and medicine The medical world can be a confusi…

Synthesis practice problems. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of…

Amine naming 2. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of basic high s…