This demonstration shows some differences between potable (drinkable) water and non-potable (non-drinkable) water. Variations in temperature, turbidity and pH level also determine the types of microorganisms that can thrive in each water sample. Continue reading
On April 26, the Cassini spacecraft flew closer to Saturn than ever before — between the gap that separates the planet from its rings.
Since then, Cassini has been transmitting dozens of images of Saturn’s surface. Here, NASA has compiled all the images into one, incredible video that reveals exactly what Cassini saw.
One of the sights that surprised scientists most was the sharp edges of Saturn’s hexagon and its central vortex. Saturn’s hexagon is a giant cloud system on Saturn’s north pole, and it contains a central vortex.
The sharp edges scientists saw in these latest images suggests that the cloud system and its vortex are not mixing with their surroundings. But what’s preventing the clouds in the hexagon from mixing with the clouds right next to it is a mystery.
This first dive marked the beginning of the end for Cassini. For the last 13 years, Cassini has explored Saturn and its moons. But its time will come to an end this September, when it will enter Saturn’s atmosphere and burn up.
Read more: http://www.businessinsider.com/sai
Hank gives us a tour of the most important table ever, including the life story of the obsessive man who championed it, Dmitri Mendeleev. Continue reading
The Italian scientist, Galileo Galilei, created one of the first thermometers in the late 1500s. It was a rather simple apparatus involving a long thin tube, open at one end, and a pan of water. Students can replicate this experiment, demonstrating the principle that air expands when heated.