Science Friday: What Happens When Two Galaxies Collide?

What happens when two worlds collide? In the first of several activities, future physicists experiment with colliding ball bearings or Newton's cradle. Another activity requires the use of an air track with cars to examine collision....

Sometimes fuzzy, sometimes irregularly shaped—and occasionally cannibalistic? These are just a few of the remarkable galactic facts contained in a short video that's sure to amaze! The narrator describes the four main types of galaxies,...

Scientists published a study in 2010 that claimed they had discovered an alien bacterium that could create its own DNA with arsenic. Other scientists were skeptical and tried to duplicate their results, without success. In this podcast,...

Did you know that your DNA can be damaged tens of thousands of times per day? Learn about the ways that damage to just one strand of your DNA can be fixed, or in extreme examples, result in genetic mutation such as cancer. 

What happens when two teens collide? Find out when RJ runs into Chloe in the school hallway! After their collision, they discuss Newton's third law of motion. Their collision is replayed a few times to identify the action and reaction of...

Everything is a little bit magnetic, says physicist Richard Hill, of The University of Nottingham. So with a powerful magnet, it is possible to levitate almost anything--strawberries, water, insects. In a recent study, Hill levitated...

Ever had a concussion? Watch a video that explains the complicated dangers of concussions and how brain neurons are damaged during a concussion. Discover ways to heal the brain after a concussion and the long term effects of head...

Can your physical science classes describe what happens when two objects collide? Whether they are new to the study of kinetic energy or just brushing up on their skills, pupils can observe the outcome of a variety of collisions...

The DNA in just one of your cells gets damaged tens of thousands of times per day. Because DNA provides the blueprint for the proteins your cells need to function, this damage can cause serious issues-including cancer. Fortunately, your...

Ever heard of the Great American Biotic Interchange? The joining of North and South America caused one of the greatest biological migrations in Earth's history. Watch the continents collide and learn about the global consequences.