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  1. SongDog

    COVID From 60 Minutes an Epidemiological View Of What Vaccination Level Is Needed

    Influenzas circulate and mutate in many wild and domesticated specie, not just humans. As a result, new variants arise frequently in swine, birds, even camels. AFAIK, we don’t yet see a similar behaviour for coronaviruses.
  2. SongDog

    How does the eye detect the angle of incidence?

    In simple terms, for a perfect lens, the azimuth and elevation on the retina of the points which are illuminated with images of your two cubes are simply a scalar multiple of the angles on which they were incident upon the centre of the lens. The scalar multiple is a function of the lense shape...