How a breathalyzer works (alcohol sensor)

I teardown a commercial, handheld breathalyzer and discuss how it works, then test a standalone ethanol sensor.
http://www.seeedstudio.com/depot/images/product/MQ303A.pdf
http://www.kosmodrom.com.ua/pdf/MQ303A.pdf
http://www.sparkfun.com/products/8880

http://www-personal.umich.edu/~mswool/publications/Gas_Sensors_preprints.pd.pdf

Self-cleaning glass windows

Alien technology?  No!  A thin coating of titanium dioxide on your windows will use the UV in sunlight to burn away dirt and wash itself clean with rainwater.

Cookie Perfection Machine

This machine allows me to mix a single cookie and vary the recipe for each cookie on the sheet. Hence, I can test many different recipe variations with one batch of ingredients in one afternoon.

Music:  Cool Vibes - Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/

Ruby laser design process

I describe the basics of ruby laser design. I'm building a laser with about 8KJ of electrical pump energy.

http://www.susiebeesley.co.uk/wp-content/uploads/2013/11/PKIlampbrochure.pdf

http://www.perkinelmer.de/PDFS/downloads/dts_applicationnotehighperformanceflash_final071004.pdf

http://www.fenixtechnology.com/fenixcalc.html

http://www.i-fiberoptics.com/

More info about sputtering: process parameters, chamber construction

I describe a few more details about the sputter process that I have used to make ITO coatings.