The science of wineglass tears (or wine legs)

The surface tension of water and the evaporation of ethanol produce an interesting effect in a wineglass known as "tears" or "legs".  The process is caused by the Marangoni effect, which explains how toy soap boats work among other interesting things.

Tools and Tips #1 from Applied Science

I present some of my favorite tools and techniques from the workshop.
https://www.patreon.com/AppliedScience - Support Applied Science

Cable tie gun - www.mcmaster.com 5401T11

Devcon plastic welder - http://www.amazon.com/Devcon-22045-Plastic-Welder-Dev-Tube/dp/B003NUGL9S/

E6000 adhesive - http://www.amazon.com/E6000%C2%AE-Craft-Adhesive-3-7-oz/dp/B007TSYNG8

3M DP-8005 - www.mcmaster.com 7467A32

Ikea lamp - http://www.ikea.com/us/en/catalog/products/20169658/

Well nuts - www.mcmaster.com 93495A130

Irwin tap wrench sockets - http://www.amazon.com/Hanson-3095001-2-Piece-Adjustable-Socket/dp/B000TGM7HY/

Double-sided tape - http://www.findtape.com/product190/Permacel-P-02-Double-Coated-Kraft-Paper-Tape.aspx

Gaffers tape - http://www.findtape.com/category/gaffers-tape-rolls-of-industrial-gaffer-tape.aspx

Drill bits for plastic - http://www.mcmaster.com/#plastic-cutting-drill-bits/=vtpc4m

Covert radio pen with bone conduction speaker

https://www.patreon.com/AppliedScience ---- Donate here!
I built a tiny radio into a ballpoint pen that allows the user to hear audio by casually biting the pen.

How a horn amplifies sound (hint: Impedance matching)

A horn-shaped speaker is louder than an equivalent speaker without the horn.  This fact doesn't violate physics because the horn is acting as a matching device between the speaker and the air around it.

Photo Credit for phonograph: Norman Bruderhofer,  Collection of John Lampert-Hopkins

Chocolate gun dispenses edible molten chocolate

I modified a standard hot glue gun to dispense molten semi-sweet chocolate. This is great for decorations and gingerbread houses.