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Blood doesn’t normally contact neurons. The brain is surrounded by cerebrospinal fluid, not blood. There is actually a blood-brain barrier. If blood touches neurons it can damage them but if blood is touching your neurons there is something badly damaged anyway.

I was just looking for “It’s dimmer.” That’s what provides the energy that’s absorbed in the medium, not any change in frequency.

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I don't know. I am a normal dude in IT that spends too much time on the internet. I have a middling understanding of this stuff and am curious. If a refractory medium like a lens behaves differently than a filter that would be interesting. 😁

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Well, what's different about monochromatic light that's passed through a filter?

The light must give some of its energy to the medium so if the frequency doesn't change then where does this energy come from.

The frequency is the same everywhere. (The easiest way to see this may be to note that the electric and magnetic fields must be in sync everywhere, including the interfaces.)

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Not identical but likely attacking similar parts of the microbe. Also keep in mind when you get infected you have a polyclonal antibody response which basically means a bunch of different antibodies attacking different antigens or spots. Collectively they will work pretty similarly but the individual antibodies are not likely to be exactly the same even when they are targeting the same spot.

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Does this mean that the light leaving the medium is of a lower frequency? Can this be setup in a way to increase the frequency and take energy from the medium?

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Darwin's book is about inheritance as a broad concept, and the whole point of the book is to refine it a lot and use it to explain the evolution of species.

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