An antigen is just a word for something your immune system recognizes, like pieces of virus or bacteria, to help it determine what is foreign and needs to be killed/removed. So no, we often have very different antigens in our bodies, since we don’t all have the same viruses or bacteria in our bodies.

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Do you mean antibodies? Antibodies are the proteins that mark antigens (foreign material) as non self and tag it for destruction.

Everyone has a different library of antibodies/immunoglobulins. If you are comparing two people, one may have antibodies to antigens the other does not have (think vaccinated vs non vaccinated unexposed.) The two may also have structurally distinct antibodies but target the same antigen (like two people who get the same illness and develop an immune response and recover. There are also some antibodies that are the same between people, (like between a mother and neonate with antibodies that cross the placenta or are carried in breast milk.)

That’s my simplest explanation.

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"The bass" is not separately encoded Ion it's own channel. However it is true that the signal pressed onto a vinyl record is not the original source signal, but it's pre-filtered with the RIAA response curve, effectively dampening low frequencies. During playback, a preamplifier stage reverts that filtering to reconstruct the original waveform.

https://en.m.wikipedia.org/wiki/RIAA_equalization

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That's when you take too big of a bite off your cone and a little ice cream gets on your nose 😀

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wait are you saying that a third layer of information is encoded ????

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Not quite. There is no law that says the energy must be zero. That was just a starting assumption in order to arrive at some kind of answer.

What Conservation of Energy says is that the total energy (potential + kinetic) does not change as the body moves toward Earth. If it starts at zero energy, then the energy remains zero. But the energy could have started with some other value too.

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Any good documentary/video suggestions that deal with space, the universe, planets, etc?

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Yes.

that's really interesting

I was under the (incorrect?) impression that one channel was encoded in the up/down axis and the other in the left/right axis of the stylus

Does encoding them in the way you described improve fidelity/reduce noise/skips or something?

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