Researchers confirmed through DNA sequencing that the infection in the child is not a new infection, but was the one passed from the mother.
Indeed. Parent was talking about Special (simultaneity).
Re: Mercury's precession, I'm still a believer in Vulcan.
made out of quantum particles!
Everything is made out of quantum particles, so this is rather a moronic reply. That being said, I'm quite satisfied with the "entanglement" arguments made by others (the photon detector needn't decohere/collapse the waveform--it could simply entangle with it, in which case, if you really did have a box with a cat completely isolated from the outside universe, then the paradox would still hold). I probably won't be making this response in the future, or at least not without the caveat of "from a practical perspective" or "I prefer Bohr's resolution to the paradox wherein..."