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896 points tux3 | 1 comments | | HN request time: 0.294s | source
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jerf ◴[] No.43546861[source]
One of my Core Memories when it comes to science, science education, and education in general was in my high school physics class, where we had to do an experiment to determine the gravitational acceleration of Earth. This was done via the following mechanism: Roll a ball off of a standard classroom table. Use a 1990s wristwatch's stopwatch mechanism to start the clock when the ball rolls of the table. Stop the stopwatch when the ball hits the floor.

Anyone who has ever had a wristwatch of similar tech should know how hard it is to get anything like precision out of those things. It's a millimeter sized button with a millimeter depth of press and could easily need half a second of jabbing at it to get it to trigger. It's for measuring your mile times in minutes, not fractions of a second fall times.

Naturally, our data was total, utter crap. Any sensible analysis would have error bars that, if you treat the problem linearly, would have put 0 and negative numbers within our error bars. I dutifully crunched the numbers and determined that the gravitational constant was something like 6.8m/s^2 and turned it in.

Naturally, I got a failing grade, because that's not particularly close, and no matter how many times you are solemnly assured otherwise, you are never graded on whether you did your best and honestly report what you observe. From grade school on, you are graded on whether or not the grading authority likes the results you got. You might hope that there comes some point in your career where that stops being the case, but as near as I can tell, it literally never does. Right on up to professorships, this is how science really works.

The lesson is taught early and often. It often sort of baffles me when other people are baffled at how often this happens in science, because it more-or-less always happens. Science proceeds despite this, not because of it.

(But jerf, my teacher... Yes, you had a wonderful teacher who didn't only give you an A for the equivalent but called you out in class for your honesty and I dunno, flunked everyone who claimed they got the supposed "correct" answer to three significant digits because that was impossible. There are a few shining lights in the field and I would never dream of denying that. Now tell me how that idealism worked for you going forward the next several years.)

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finnthehuman ◴[] No.43549233[source]
>The lesson is taught early and often. It often sort of baffles me when other people are baffled at how often this happens in science,

Math and some sciences have the aura of definitive right and wrong, so even though by college everyone knows the expression "give the answer the teacher wants to hear", they just think in those subjects the teacher has access to absolute answers.

The primary thing taught by our schooling system (and 2nd place isn't even close) is bureaucracy obedience. This has the obvious effects, but one of the subtler ones is deference to "science" as an authority requiring obedience rather than the process of figuring shit out.

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1. bigger_cheese ◴[] No.43552041[source]
I studied Engineering rather that physics. In our lab reports we were expected to include a discussion of the results and the experimental method. It was basically expected that the report should include associated commentary around potential sources of error and modifications to improve the experimental accuracy.

I don't recall ever being marked down for failing to obtain the "correct" result the impression I came away with was so long as you were thorough in your discussion and analysis the exact result was less important.

I can remember my second year thermodynamics class had a fairly complicated lab which involved taking measurements from inflow and outflow of various heat exchangers in a variety of configurations (Counter flow, Cross flow etc) then computing the efficiency of each configuration. I recall getting into minutiae in the report about assumed friction factors and suggested methods to asses the smoothness of the pvc pipes etc. to improve the accuracy of calculations etc.