[–] 22 points 1 day ago

It is unrelated, but it was a reference to how after the Potomac River mid-air collision, Trump blamed it on DEI before anyone even knew what had happpened and Duffy echoed that claim saying the FAA had been ruined by DEI.

I will never forgive them for responding to a tragedy in that way.

At least this event is just a big disruption and afaik didn't result in any accidents. Therefore I feel entitled to mock them.

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  • [–] 10 points 3 days ago

    Dewitt D20 diamond shape scuffle hoe with the 72" pistol grip handle. If you keep the blade nice and sharp it makes controlling weeds and prepping planting areas so much easier. It slices parralllel to the soil surface so you can cut weeds at the root without a lot of effort, and it's one of the only tools I've found that can break up dense mats of vines.

    Bucket style towel warmer. No specific brand recommendation here. I got mine from the Aldi aisle of shame. You just throw your towel in before getting in the shower and 10 minutes later it's nice and warm like it just came out of the dryer.

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  • [–] 21 points 3 days ago* (last edited 3 days ago) (1 child)

    This story sounds familiar. Allow me to offer a couple suggestions.

    Water the ground about a half hour before you need to dig. Use plenty of water but don't make it muddy.

    Sharpen the edge of your shovels with a file or grindstone. It makes a world of difference for reducing the effort it takes to cut through even small roots.

    Get a mattock and a long handle ice chopper for large roots. Keep those tools sharp as well.

    I broke two wood handled shovels within 3 weeks of buying my first house that had heavy clay soils. I also resorted to buying the metal handled kobalt shovel. These days I'm back to mostly using a wood shovel with these tips and only break out the metal handled shovel for really demanding work. The wood handled shovel is much lighter and therefore less fatigueing to use.

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  • [–] 3 points 2 weeks ago (3 children)

    I realize this is a basic question, but how do you isolate zones of the vacuum table to maintain vacuum just where your part is? Is the waffle grid not continuous? Do you have something to pack under the perimeter of your stock to seal it?

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  • [–] 3 points 1 month ago

    Adding a fan to a sailboat might help you stop said sailboat. Adding a fan to a swamp boat is not stupid and does work.

    https://www.airliners.net/forum/viewtopic.php?t=738011

    I tried to find a figure for what percentage of the normal operating thrust a thrust reverser configuration can provide and couldn't readily find that info. However, according to that forum, thrust reversers only really reduce stopping distance by 10% or so and are deployed primarily to help maintain control in case there is uneven braking due to poor runway conditions.

    Also, multiple sources say thrust reversers only work effectively at high speeds, and lose effectiveness at low speeds. I didn't find an analysis on why that is the case, but it has something to do with the flow rate of air through a jey turbine being much lower at low speeds.

    A sailboat will always be at low speeds relative to the wind. A thrust reverser configuration might provide some usable thrust, but you would be much better off just using the fan directly for propulsion and skip the sail altogether. Even that is very inefficient compared to propelling against water.

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  • [–] 29 points 1 month ago (2 children)

    Quantum tunneling isn't as mysterious as popular discourse likes to make it sound.

    Quantum tunneling involves barriers to movement. Think an insulator around a wire. Electrons can freely move throughout the bulk of the metal and even just a little bit outside of the metal, but they can't transfer to the atoms in the insulating material. However, if you have an arrangement like two pieces of metal separated by a very small bit of insulator, tunneling can become possible. Classical mechanics would say that any amount of insulator between conductors should be able to completely stop charge transfer between conductors no matter how small. However, the wave function that describes an electron's characteristics isn't just a single point. It is spread out a bit. If the insulating layer is small enough, sometimes the electron wave functions will span through the insulating layer and a small portion of it extends into the next conductor. This means that if we measure the charge state on both pieces of metal, every once in a while, the charge state of one will decrease at the same time that the charge state of the other increases by the value of 1 electron. Lots of factors change how often this happens, such as a strong electric field. So do we know where the electron has gone? Not specifically, but we know the charge states of the two regions and it is otherwise confined. Do we know if it is the same electron? No, electrons are completely indistinguishable, and this is actually a pretty important concept for quantum mechanics. But whether it is the same electron, or if there's some exchange that occurs during the tunneling doesn't really matter. We know that a charge transfer has occurred through a barrier without adding or removing energy.

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