Learn how to arm wave with Hip Hop dancer and choreographer Matt Steffanina. Then make it look smooth with lots of practice!
Maude, Olive, and Betty of Olive Us make Snoball Cookies with the help of filmmakers Tiger in a Jar. You can find the recipe here.
We’ve seen this experiment a few times before, but never with Hello Kitty “catonaut” in a Japanese rocket made by a 12-year-old. And perhaps not with such a glorious pop:
NASA doesn’t have a lock on space exploration anymore. Just ask Lauren Rojas, a seventh grader in Antioch, Calif., who recently launched a balloon to 93,625 feet using a do-it-yourself balloon kit from High Altitude Science…
The project is a terrific illustration of just how accessible the near-space environment has become. High Altitude Science was founded two years ago by Joseph Maydell, a flight controller for the International Space Station at NASA’s Johnson Space Center in Houston, who wanted everyone to experience the beautiful views of the planet that he got to see in the course of his work.
Not only does Maydell sell a kit and a flight computer on his site, but he also includes tutorials to get started with.
From the archives, more views of Earth’s curvature.
via Scientific American.
How do you make a cloud? On her show, Head Rush, Mythbuster’s Kari Byron demonstrates how clouds are formed by making one in a bottle.
For this experiment, you can use a bicycle pump with a rubber stopper attachment, rubbing alcohol and a clear 1 liter bottle. Don’t forget goggles and some adult supervision! Steve Spangler’s Science has more:
The reason the rubbing alcohol forms a more visible cloud is because alcohol evaporates more quickly than water. Alcohol molecules have weaker bonds than water molecules, so they let go of each other more easily. Since there are more evaporated alcohol molecules in the bottle, there are also more molecules able to condense. This is why you can see the alcohol cloud more clearly than the water cloud.
Clouds on Earth form when warm air rises and its pressure is reduced. The air expands and cools, and clouds form as the temperature drops below the dew point. Invisible particles in the air in the form of pollution, smoke, dust or even tiny particles of dirt help form a nucleus on which the water molecules can attach.
From the archives: clouds and experiments.
Update: Here’s an even more simple version of the experiment! Thanks, @nicolasdickner.