While reading the Wikipedia bit about the Apollo 11 Moon Landing, I was reminded of an event I frequently think of and cite as an example of why it is important to know (and display) your unit of measure.
Google: Mars Climate Orbiter Mission Fails Due To Unit of Measure Error
Distance is a good example. Say you are telling someone how to get somewhere and you say: "Go 3 and turn Left." Ummm, OK... 3 what? Blocks? Miles? Light-years? There is a difference. Liquid is a good example too. "It takes 10 to get that done." 10 ounces? 10 gallons? 10 Acre Feet? ... Again, big differences.
Just a quick thought.
Have Fun!
:-)
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