One Weird Math Trick Estimates ANYTHING (Fermi problems)

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There once was a scientist who was SO GOOD at estimating complicated questions from almost no information that they named this style of problem after him.

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Police officer: Sir, do you know how fast you were going?
Me: *Inhales*...

pirateadam
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As a middle school science teacher, I use fermi estimates ALL THE TIME to answer crazy questions from my students that I have no way of 100% correctly answering on the fly

Jason-uegi
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"Is that a firm estimate?"

"No, it's a Fermi estimate."

"Isn't that what I just asked?"

Siansonea
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Thanks Kyle, now I can get every question on my math tests almost right.

lucafiore
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The best part of a Fermi estimation is that once you've done it, you have an incentive to check your work, providing yourself with even more points of confidence.

nightthought
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I remember doing these kinds of exercises in school. My dad calls these SWAGs: Scientific Wild A$$ Guesses

mattgunnell
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"The air's moving around at around 2 KpH in here by the way." Two Kyles per Hill? WHERE IS THIS OTHER KYLE?

mstieler
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"what's 9+10?"
Enrico Fermi: "21"

THE_KIRYU
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Fermi guesses are PERFECT for making sure your "precise" calculations make sense.

The funniest example I found of it is "How many piano tuners work in Chicago?"
The author looked up the population of Chicago, and then guestimated their way to within 5% of the right answer. It was pretty impressive, NGL. Great work, as always!

squishr
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I love how the Drake equation is simply a Fermi estimate, jumbo sized.

enginerd
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"A few years ago when I was trapped in a formless, emotionless void-".

Ah, so working on Because Science

niamhythedegen
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"You are technically correct. The best kind of correct."

ReiAyanami
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I really think this should be taught in more courses than just physics. I was a physics major for 5 minutes before switching to engineering and my physics classes were the only ones to teach Fermi estimations. The thing is, this technique doesn't require any specific vault of knowledge, it just requires that you be taught how to think. Any student could learn this, regardless of major. It also would be super helpful for those annoying job interviews where someone asks you "How many pianos are in New York"?

TheCharmanderMaster
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That "Texas Instruments, sponsor us" at the end made me laugh my ass off. I'm sitting at work, on break, at a Texas Instruments facility in TX at this very moment

goldenoreo
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Title: How to estimate anything
Me: All non-infinity numbers round to zero

WitchVulgar
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"How many great white sharks are swimming off the coast of california?"
All of them, you don't swim on a coast

GarethTheGreat
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"I've stood next to a large dump truck before" as Kyle halfway smirks at the camera.

LegendForsaken
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What’s even more fun is using the right answer to triangulate, cross reference, and analyze my guesstimation biases

YouTubeCommenter
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"No this isn't cheating, this is using what we have available."
So are you saying that I can just google answers instead of using this method?

Ariuss
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I feel like this should be properly taught in school. Over in Australia I’ve never once heard of this. Just feels like it’s a great way to get people to think about a problem instead of knowing the answer to a problem

thecrimsonfire