Daily Archives: July 18, 2008

It's Even Better Than the 'Clapper'

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Students Who Use ‘Clickers’ Score Better On Physics Tests

If, like me, you don’t already know what a clicker is and how it’s used, read this (buried nine paragraphs in) first:

In clicker classes, multiple choice questions appear on a large computer screen at the front of the lecture hall. Students hold the wireless devices, which resemble small calculators. They cast their votes for the correct answer based on their understanding of the part of the lecture that was just given. A bar graph shows the percentage of students voting for each answer.

The first third of the story will make more sense once you have this information.

It's Like, Symmetry, Dude!

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Hubble Kaleidoscope Finds Evidence Of Space Looking All Crazy

“With their unprecedented resolution, the latest images from the new kaleidoscope reveal that space, once thought to be isotropic, is actually continuously expanding, unfolding, and rearranging in a series of freaky patterns,” said astronomer Douglas Stetler, head of the Space Kaleidoscope Science Institute in Baltimore. “It’s an exciting time for the field of astrokaleidoscopics, or anyone interested in the vast, wacked-out nature of space.”

[…]

Despite excitement over the discovery that space is all crazy-looking, a number of legislators have threatened to cut funding for NASA’s kaleidoscopic program. An outspoken critic of the agency, Sen. Susan Collins (R-ME) said she hopes NASA scientists don’t just use the kaleidoscope a few times and then lose interest and never touch it again, like they did with the Brookhaven Neutrino Spirograph, Fermilab’s Particle Slingshot, and the Very Large Slip ‘n Slide Array in New Mexico.

However, it should be noted that they still continue to play around with the boxes those devices came in.

Take Your Ritalin!

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The Hyper-Sub

Fast boats need to be light, but subs, of course, need negative buoyancy.

The ballast systems in most submarines can displace only about 20 percent of the cabin’s volume, but the Hyper-Sub’s ballast chambers double the volume of the cabin. The boat uses a high-pressure pumping system to rapidly fill these chambers with water or air, quickly changing its weight and buoyancy and allowing it to submerge or surface in less than a minute. “This creates more than 12 tons of lift [or sink],” Marion says.