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Ozone layer and eukaryotes show up in the Proterozoic eon. Great oxygenation event (oxygen catastrophe). Biology Life is beautiful! From at…

An overview of the question of how life first arose on Earth. Biology Life is beautiful! From atoms to cells, from genes to proteins, from …

Introduction to viruses. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is…

Overview of gene regulation in the Lac operon. Discussion of CAP, cAMP, lac repressor and allolactose in regulation of lac operon. Biology …

Hank and his brother John discuss heredity via the gross example of relative ear wax moistness. Biology Life is beautiful! From atoms to ce…

Refraction of Seismic Waves Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn abo…

Lifecycle of Massive Stars Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn abou…

Hank explains speciation - the evolutionary process by which new biological species arise - in terms of finches, ligers, mules, and dogs. B…

Learn about how particles move from an area of greater concentration to an area of lesser concentration through the process of diffusion. B…

Scale of the Galaxy Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the b…

What causes precession and other orbital changes Cosmology and astronomy It's a great, big universe out there. In this section of Khan Acad…

Hank introduces us to the relatively new field of evolutionary developmental biology, which compares the developmental processes of differe…

How haploid gametes (sperm and egg cells) combine to form a diploid zygote with two sets of chromosomes. Biology Life is beautiful! From at…

Cepheid Variables 1 Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the b…

Endergonic, exergonic, exothermic, and endothermic reactions. Biology Life is beautiful! From atoms to cells, from genes to proteins, from …