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Hubble Image of Galaxies Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about …

Overview of how cells interact with the extracellular matrix. Biology Life is beautiful! From atoms to cells, from genes to proteins, from …

How amino acids form peptide bonds (peptide linkages) through a condensation reaction (dehydration synthesis). Biology Life is beautiful! F…

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

Pedigree for determining probability of exhibiting sex linked recessive trait High school biology Pedigrees Topic: Science Learn about all …

Overview of the inflammatory response. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosyste…

Clarifying some points on evolution and intelligent design. Biology Life is beautiful! From atoms to cells, from genes to proteins, from po…

High school biology The nervous and endocrine systems Topic: Science Learn about all the sciences, from physics, chemistry and biology, to …

How to determine the most and least stable conformations using Newman projections Organic chemistry Sal and Jay cover topics covered in col…

Carbon 14 Dating 2 Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the s…

Van der Waals forces: London dispersion forces, dipole-dipole forces, and hydrogen bonding. Chemistry Did you know that everything is made …

Seeing how energy and matter flows and is recycled from primary producers (autotrophs) to primary, secondary and tertiary consumers. Biolog…

Find out exactly where the heart rests in your body and what it does. Rishi is a pediatric infectious disease physician and works at Khan A…

Introduction to PCR (polymerase chain reaction). Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations t…

Working through a calculation for K-Ar dating (good to have some prior experience with e and logarithms) Biology Life is beautiful! From at…