Feynman's comment on experimental skill and openning toothpaste tube.

This is a good example of edutainment. I should edit a video on this topic.

There was one useful lab technique I learned in that course which I still use today. They taught us how to hold a test tube and take its cap off with one hand (you use your middle and index fingers), while leaving the other hand free to do something else (like hold a pipette that you’re sucking cyanide up into). Now I can hold my toothbrush in one hand, and with the other hand, hold the tube of toothpaste, twist the cap off, and put it back on. (From Surely You're Joking, Mr. Feynman).

See: 
http://blogs.scientificamerican.com/oscillator/2013/07/27/feynman-on-biology/ 

Surely You're Joking, Mr. Feynman!