How does light speed up after leaving glass or water? What do light and the President of the United States have in common?

Paul Andersen explains aspects of genetics that were not covered by Gregor Mendel. He begins with the following topics; incomplete dominance, codominance, epistasis, multiple alleles, and multiple genes. He then explains how linked...

In this video Paul Andersen describes genetics at the chromosomal level. He begins with a simple monohybrid cross as viewed through Mendelian genetics and then shows how genes are distributed through meiosis to possible gametes. This...

Today, we continue our exploration of fluids and fluid dynamics. How do fluids act when they're in motion? How does pressure in different places change water flow? And what is one of the motion annoying things about filming outside on a...

Sometimes, a single decision can change the course of history. Join journalist and author Isabel Wilkerson as she tells the story of the Great Migration, the outpouring of six million African Americans from the Jim Crow South to cities...

In this video Paul Andersen describes the four major spheres on planet Earth. The geosphere makes up the mass of the planet and includes the major landforms. The hydrosphere is all of the water and the atmosphere is all of the gases. ...

Ever wonder where your favorite Thanksgiving foods come from? Well the truth may be closer to home than you think.

Paul Andersen introduces the Punnett Square as a a powerful tool in genetic analysis. He tries to address major misconceptions that students have when use a Punnett Square. He gives a number of examples of monohybrid crosses and one...

The marriage of Orpheus, the greatest of all poets and musicians, to Eurydice, a wood nymph, was heralded as the perfect union. Anyone could tell the couple was deeply in love. So when their wedding ceremony ended in Eurydice's untimely...

Everything in our universe has mass - from the smallest atom to the largest star. But the amount of mass has remained constant throughout existence even during the birth and death of stars, planets and you. How can the universe grow...

What happens if you multiply things that aren't numbers? And what happens if that multiplication is not associative?

Paul Andersen explains simple Mendelian genetics. He begins with a brief introduction of Gregor Mendel and his laws of segregation and independent assortment. He then presents a number of simple genetics problems along with their...

New ReviewLearn how fluid speed changes in a narrowing pipe using laminar flow, the continuity equation, and a clear animation. Perfect for physics students!

Learn the physics behind ideal fluid flow and the continuity equation—complete with animation, explanation, and a real-life garden hose example.

The cross sectional area of the drag force demonstrated.

Watch the continuity equation of ideal fluid flow in action using a real river example. A clear, visual explanation perfect for physics students.

Negotiating in Germany can be long and arduous. Be prepared to have everything you say—as well as your appearance, demeanor, and manners—subjected to considerable scrutiny. Every detail of your presentation will be dissected, and the...

In Germany, the size of a company usually determines its hierarchical structure. In larger companies, upper management consists of a board of managing directors, vorstand or aufsichtsrat, which makes major decisions. In smaller...

Over time, the expansion of trade and the exchange of ideas and cultures have led to an increasingly interconnected global economy. As countries, companies, and people reassess how to operate globally, it’s clear that the way we interact...

97 Funniest Jokes

Uncle Gobb and the Green Heads – Chapter 1, Part 4

An examination of the European Migration Crisis.

South-to-North Water Transfer Project: The huge populations filling China's northern megacities have a shortage of the single most necessary resource for life: water. To solve that problem, the Chinese will soon be moving 44.8 billion...

A video entitled "Zeros" which shows how to find key features of a rational function in order to graph it.