Linux gamer, retired aviator, profanity enthusiast

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Joined 2 years ago
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Cake day: June 20th, 2023

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  • Engineers aren’t miracle workers, granted. Which is why it is their responsibility to thoroughly test the devices they design and document their limitations. It’s then on the medical industry to train doctors and nurses on those limitations.

    I’m sure pulse oximeters now are more accurate than they were 20 years ago.

    As I said, this continues to be a problem into the present day. COVID-19 patients with dark skin would suffer from hypoxia that pulse oximeters would fail to detect, leading the medical staff to fail to administer supplemental oxygen. That’s probably happening somewhere on earth as I type this.

    Do the little lights in the device need to be brighter, or have a brighter mode? Does their need to be a switch on the side? Can our cultures handle a medical device with a “white people | black people” switch on the side?


  • I’m sure there are none, straight white guys are just a favorite villain around here.

    I can think of a tech that doesn’t work as well on black people though: Pulse oximeters. A pulse oximeter works by shining two wavelengths of light through your finger to measure the amount of oxygen in your blood. It also sees your blood come and go with your pulse, so it can detect your heart rate. Well get this: melanin blocks light. A black man’s finger is more opaque than a white man’s finger, so optical pulse oximeters have been known to fail to detect hypoxia in dark skinned people. This problem has been known since the 70’s, and continues to be a problem to the present day. Because you know what happened recently? A global pandemic of a respiratory disease. Pulse oximeters failed to detect hypoxia in more black patients than white patients, who then weren’t given supplemental oxygen. So why in the last 50 years hasn’t that been addressed?







  • You want to make a midplane, a reference plane midway between to parallel planes. You click the Datum Plane button, and then the two parallel planes, and you get a plane that is perpendicular to both, not parallel halftway between. I found it easier to forget how to need midplanes than to get FreeCAD to make one.

    There’s some cool concepts in there, I make heavy use of the spreadsheet function, but I swear to every god in every pantheon that Autodesk is paying the FreeCAD development community to keep their UX at least this horrible to preserve their business model. I can’t explain this level of incompetence any other way without relying on rock chewing stupidity.