Rule Thumb facts

While investigating facts about Rule Thumb Meaning and Rule Thumb Idiom Meaning, I found out little known, but curios details like:

The 1% rule is a rule of thumb pertaining to participation in an internet community, stating that if you get a group of 100 people online then one will create content, 10 will "interact" with it (commenting or offering improvements) and the other 89 will just view it.

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Mongols under the rule of Genghis Khan pulled the bowstrings of their bows back with their thumb instead of using a "Mediterranean draw" with three fingers, so to protect their thumbs, the Mongols invented a "thumb ring"

What does rule of thumb mean?

In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across answering what is rule of thumb. Here are 12 of the best facts about Rule Thumb Method and Rule Thumb Crosswind Calculation I managed to collect.

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1. The rule of thumb “half your age plus seven” was in earlier sources understood as a formula to calculate the ideal age for the bride, instead of a lower limit for the suitable age.

2. The "Rule of Thumb" has nothing to do with wife beating. The term is thought to originate with carpenters who used the width of their thumbs rather than rulers for measuring things.

3. The old rule of thumb serving red wine in room temperature comes from chilly French medieval rooms, where the temperatures ranged between 14°C to 16°C.

4. While the origin of the phrase "rule of thumb" is unknown, it was universally meant to refer to using imprecise methods to measure length. The connotations to spousal abuse is a long-standing misconception dating back to a 1782 political cartoon mocking an English judge.

5. There is more than one 'razor' and Razors are a term in philosphy meaning rule of thumb. The most common is the Occam razor. The others are Grice, Hanlon, Hume, Hitchen's and Alder's razors.

6. Along side such "philosophical razors"(rules of thumb) as Occam's Razor and Hitchen's Razor lies Newton's Flaming Laser Sword: "If something cannot be settled by experiment then it is not worthy of debate."

7. The phrase "rule–of–thumb"'s association with wife–beating is a false etymology; the OED definition of "...a roughly practical method" dates the phrase back to 1692.

8. The rule of thumb for cruise line comfort is generally given as a minimum of 40 tons per passenger.

9. The origins of the phrase "rule of thumb" are not related to domestic abuse.