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This is tangentially related. Ever wonder how B-cells (antibody producing white blood cells) got their name?

They are named after the Bursa of Fabricius, a lymphatic organ in birds that serves as the site of B-cell maturation. (Their sister cells, T-cells, mature in the thymus). Stem cells migrate from the liver to the Bursa of Fabricius, where they differentiate and mature into B-cells.

B-cells were first discovered in the Bursa fabricii of birds, that’s why they are named B-cells. The bursa equivalent in humans is the bone marrow.

You are right. 45 billion LY is the furthest distance we can see in any direction, meaning the diameter of the observable universe is 90 billion LY across.

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You know one of those hallways in a dream that stretches out so you never actually reach the end? Light is basically trapped in one of those where the "hallway" is the fabric of space-time

It also depends on the contact arrangement and relative component sizes of the two metals, and there is a lot of complexity with corrosion locality. Wide area corrosion is often acceptable at low rates depending on the application, but even small amounts of highly localized corrosion can be structurally devastating.

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Depends on the structure, and their solubility. Do you have a true alloy or just a mix of pockets of one material inside the other?

That’s going to depend on the concentration of the corrosive electrolytes, and even then a small voltage can still result in serious corrosion over time.

Just thought I'd add that it's not just metal to metal contact that can cause galvanic corrosion. When working with carbon fibre composites the nobility of metals that are in contact/inserted are of concern as they will likely galvanically corrode due to the conductivity of CFRP.

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Thank you!

So accelerating with respect to any other object causes the CMB to Doppler shift for the observer?

Wouldn’t that mean that a truly non inertial frame would have to be at the center of a mass?

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But then there is a place in between here and there that shares a "now" with both.

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Realistically, whatever plate is following behind the sinking plate would just become the new subduction zone with whichever plate was initially going over. Also there would be a lot of mountainous terrain formations and seismic activity as islands/continents would literally have been shoved together during this process

This has happened before if you'd like to read more specifics

What is amazing is that they have less red cell generating capacity, their red cells have half the life span of mammalian cells, less oxygen carrying capacity (nucleated red cells) and no splenic storage - it’s a wonder they haven’t had a significant evolutionary disadvantage

I don't want to create a separate question so I'm hoping you can answer. If you make an alloy out of two metals far apart on the chart, say titanium and zinc, is there internal electrical activity or corrosion within the alloy?

Gravitational time dilation is at most of order one part in a million in most contexts. It's only significantly larger near black holes, neutron stars, and white dwarfs.