Recent comments in /f/askscience

UEMcGill t1_j20e69q wrote

Given a few base assumptions, and using PV=nRT the most likely scenario is minor to major bends, maybe ruptured ear drums and things from rapid pressure drop.

The subject chamber couldn't develop a full vacuum, but a ratio of chamber to plunger volume. The volume would change the temp would drop a little and the pressure would drop a lot. Reverse it and pressure and temp go up. But if the pressure drop was high enough the nitrogen in solution in ylur blood would come out but the pressure rise again wouldn't be enough to make go back in solution.

The bends are painful and starts in places like the joints but can mean death if severe enough.

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thegypsyqueen t1_j20dllp wrote

There is no true comparison study of these strategies and for every study looking and finding handoff errors there is another showing long shift lengths also increase errors. We very much do not know which one is “better” but physicians would argue that it’s not humane to accept a system that forces them to work 24, 36, or more hours in a row. We are already working an incredible amount of hours in a week. My point is, this is not a forgone conclusion and the biggest study looking at your argument of increased hours being superior for reduction of errors was a biased study conducted by a group of resident directors.

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Octavus t1_j20c6b6 wrote

There isn't believed to be anyone left in the Americas or Tasmania who does not have any European ancestry from the last 500 years.

Going the other direction Paleo Eskimo bridged the gap for a while between the Americas and Asia. Their culture spanned from Russia through Alaska into Greenland.

There was a continuous but some gene flow between Australia and South East Asia. Any other isolated groups of humans have only been isolated for a few hundred years.

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przyssawka t1_j20bd9t wrote

Polyphasic as a necessity more like. Jokes aside not really, the work is structured in a way that wouldn’t allow for the polyphasic sleep cycle outside of on-calls (and even then ER can wake you up at any moment). Not to mention I have yet to see research that proves that it’s a valid and sustainable alternative to regular cycle.

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thephoton t1_j20ak83 wrote

> At some point 7,300 to 5,300 years ago if someone had a living descendant, then all of humanity is their descendant.

Weren't, for example, Native Americans, isolated from Europe for more than 7,300 years?

So if you consider someone living in the Andes with pure Native American ancestry, how are they descended from Cheddar Man?

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ninja1327 t1_j209x44 wrote

Let's say the scenario is this:

  1. When fully pushed down, there is still room for a human to stand/sit so no way the person would get squashed.

  2. No part is stuck and this is a normal environment/medium (a lab in a building so to speak)

  3. What happens to the human body when it's pressed down and when it is pulled up? I know it has to do with negative/positive pressure but unsure what would realistically happen

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Hot_Stick_1040 t1_j209ih9 wrote

Not surgery related but in our icu our intensivists shifts are literally a week long. They are on site for as long as they need to be during the day (07:00-19:00 but as late as 23:00 some days) rounding /doing procedures /meeting with family /admitting new patients /consults /code team then they go home when all of that is done, but come back for any problems /crises and are on call the entire time they are not on site. We had a patient ask his long the doctors shift was and when we told her, her eyes got really large lol. It’s unfortunate but it’s the model that is the least taxing.

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