One of the great treats of my chemistry education at UT-Austin was having the original gaseous diffusion process for enriching uranium explained to me by a man who worked on the Manhattan Project to implement it, the late great Dr. Norman Hackerman. Bill treats it just as well, and goes on to cover the details of the more modern gas centrifuge process.
A finger rubbed in superhydrophobic aerogels and submerged in water takes on a decidedly T-1000-esque appearance. And a droplet of water on a piece of paper treated with the same substance behaves more like a drop of mercury on a piece of glass. Definitely worth a click and a few eyeball-seconds.
In this, the fourth installment of Engineer Guy Series #4, Bill, Patrick, and Nick show off the engineering that accounts for three key characteristics of laser light: single wavelengths, narrow beams, and high intensities. Highlights include laser retinal surgery, the difference between phosphorescence and fluorescence, and a rather more sophisticated treatment of laser physics than is common in popular science.
In this off-the-cuff video, MIT prof and MAKE pal Gregory Charvat shoots Nerf darts into the beam of an old X-band Doppler radar gun with its output hacked into a linear power supply, a preamp, and finally into Greg’s living room stereo system. The signal sounds like a cartoon sound effect!
Almost two years ago to the day I wrote a post about how much I wanted to see a reaction of the type called “explosive polymerization.” That phrase appears here and there on hazard warnings for certain compounds and in the general context of chemical safety, but I could find little online info about exactly […]
We covered Flickr user yamamo2’s (and his father’s) first high-performance double pendulum build back in 2009. The first version would swing for about 10 minutes, without added energy, after being started. The latest version swings for fully twice that, as the embedded video—all twenty-two minutes of it—thoroughly demonstrates. I haven’t seen any info about the design changes required to achieve this level of performance, unfortunately.
As I wrote about a month ago, one of the many unusual phenomena Ben Krasnow has produced in his garage is supercritical CO2. As you may recall, Ben machined a custom acrylic pressure vessel so he could get (and give) a good look at a state of matter that most of us have little experience of. Since then Ben has inadvertently had a chance to observe another extremely unusual effect: the carbonation of solid acrylic.
