Smarter Every Day - What I learned from President Obama has been added as a related post - related requested by PlayhousePals on that post.

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Smarter Every Day: Turning Gravity into Light has been added as a related post - related requested by eric3579 on that post.

Beats the hell out of me.

Just to noodle around a bit, the only extreme I can think of about the scales would be to substitute an extremely low density object for the wood. Say, a helium filled balloon? But that assumes that she did in fact mean equal mass for the two objects, and wouldn't actually give valid readings on a scale in atmosphere anyway.

Extreme cases are a rather specialized approach, as I remember...its not really a common, or easy way to get answers. I got the feeling this was kind of a "wannabee" presentation. Like she wanted to do "Smarter every day" stuff but isn't quite able to find and explain interesting non-intuitive problems well.

Smarter Every Day - International Space Station Tour has been added as a related post - related requested by PlayhousePals on that post.

*related=http://videosift.com/video/Smarter-Every-Day-Devil-Facial-Tumor-Disease

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High Speed video of Canon DSLR Shutter - Smarter Every Day has been added as a related post - related requested by Zawash.

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And that's why you have a slowest "flash sync speed" - if you shoot at faster shutter speeds than the flash sync speed (typically 1/200s-1/250s), the whole sensor wouldn't be exposed at once, and the lower part of the frame would be dark.
*related=http://videosift.com/video/High-Speed-video-of-Canon-DSLR-Shutter-Smarter-Every-Day
*related=http://videosift.com/video/Ultra-High-Speed-Video-of-Nikon-D3-Shutter-Action

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Smarter Every Day - AK-47 Fired Underwater at 27,450 FPS has been added as a related post - related requested by lucky760 on that post.

I'm forgetting old shit faster than I can learn new shit, so I am, technically, NOT getting smarter every day.

One for you, Destin explains how he got the leafcutter ants to carry his sign in the latest Smarter every day:

http://videosift.com/video/How-to-get-Ants-to-carry-a-sign-Smarter-Every-Day