What's a good system to use?

Always tell the truth and follow the 10 Commandments.    And if that doesn't work, then the hell with commandment 5 thou shalt not kill.    Waste everyone.

Metric seems pretty popular. 

Dewey Decimal System

Linux

Boo!  I talk to someone almost daily who uses it.  I keep a list of conversions in front of me but my brain is not adapting. 

Boolean because it's already an intrinsic part of your life whether you realize it or not.

Do unto others. And do it first.

if else else if?