Can you feel the gravity?
This is the Best Presentation Ever Given
Hair straightener, by Amber Kates
That hair isn’t on fire. And the hair straightener isn’t smoking. We’re actually seeing changes in air density caused by the rising heat. Our eyes wouldn’t pick up on any of this. We would just see clear air — in other words, nothing.
Candle, by Andrew Kempchinskey / Lighter, Shaun McConnaghy
Burning hand sanitizer, by Nick Neumann / Marshmallow, by Benjamin Davis
These last two visualize flow that isn’t caused by heat:
Golf ball, by Joseph DeMartino / Soda, by Jena Pedersen
Here’s how these images were made:
The technique has a fancy, partly-German name: Schlieren Flow Visualization. It can be used reveal any change in air density. Engineers use it to test the aerodynamics of different vehicles, like this YT-1300 light freighter:
Looking at these videos got me thinking: Sound is just a moving compression wave. It creates areas of more dense air and less dense air. Could I use this technique to SEE sound?
Stay tuned for the answer!
Room-temperature conditions cause stress, suppressing immune responses.
.. “in mice housed at room temperature, tumour growth was faster than in those housed at 30 °C, and immune responses to cancer were suppressed.” ..
10 incredible microscopic GIFs
Every day, life is going about its business, but we can only see a fraction of the organisms around us with the naked eye. Bacteria, protists, and tiny multicellular creatures live in a world that is completely alien to us and only visible through the microscope. Thanks to the wonder of science, we can dive into this world and see how these wee beasties get along. Here are 10 of the coolest in GIF form. Click the gallery to see each one of the glitches and then check out the full explanations of each animations below, without your browser being weighed down by all those hefty GIFs!