Could Dinosaurs Have Been Warm-Blooded?

For a long time, scientists have debated whether dinosaurs were warm-blooded or cold-blooded. Turns out, they were probably somewhere in between.

Hosted by: Michael Aranda
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Stacked Ball Drop and Momentum

What happens when you drop a perfectly balanced stack of balls? And how is the result like a supernova? The classic momentum transfer demonstration, at the next level.

A big thank you to my nephews and niece Drew, Max and Whitney for creating the trampoline footage!
Thank you to the Vlogbrothers for sponsoring this video, to Kyle Kitzmiller for filming, and to Island School for providing the balls (ischool.org).
Music: YouTube
Space Images/animation: NASA

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Rayleigh Scattering: Why does the sky look blue?

raleigh scattering

««« By Stan Taylor…..

When light from the sun hits the Earth’s atmosphere, the shorter wavelength blue light gets scattered in all directions at the same time. This is why the sky appears to be blue. The intensity of blueness is greater directly overhead compared with the blueness closer to the sunlight. This is caused by the so-called Rayleigh effect.  Click on the link below for a grade 7 activity that illustrates the Rayleigh effect.

rayleigh_scatter activity