Crash Course
Chi-Square Tests - Crash Course Statistics
Today we're going to talk about Chi-Square Tests - which allow us to measure differences in strictly categorical data like hair color, dog breed, or academic degree. We'll cover the three main Chi-Square tests: goodness of fit test, test...
NASA
X-ray 'Tsunami' Found in Perseus Galaxy Cluster
Combining data from NASA's Chandra X-ray Observatory with radio observations and computer simulations, scientists have found a vast wave of hot gas in the nearby Perseus galaxy cluster. Spanning some 200,000 light-years, the wave is...
Teacher's Pet
Temperature
What is temperature, and why are there three different temperature scales? Young scientists learn the true nature of temperature with an informative video. The narrator discusses all three temperature scales and the relationship between...