Tier List of the DISASTROUS US Measuring System

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Here's a list of questions that get answered in this video:
What is the origin of foot?
What is the history of the inch as a unit?
What is the difference between fluid ounce and ounce?
What is an acre?
How was a mile defined as 5280 feet?
How many pounds is a ton?
Are pounds mass and pounds force the same?
Why were 0 and 100 selected on the Fahrenheit scale?
Can a horse actually generate 1 horsepower?
What is 1 ton of refrigeration?
What is a BTU (British Thermal Unit)?
What is the mass unit slug?
Why was American Wire Gauge created?
What are the units inches of water and inches of mercury?
Is Rankine the same as Fahrenheit?
What are the conversions between teaspoon, tablespoon, cup, pint, quart and gallon?