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If we see tracks in bubble or Wilson chamber, it means that particles are everywhere and can leave tracks in gases and liquids. They can also penetrate concrete of the building levels in the lab. So they definitely penetrate our brains, retina, optic nerve and so on. But why don't we see any flashes or glitches, related to these particles? I heard astronautes can see something, but why doesn't it comnon down here? Do we have some physiological protection for this?

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    $\begingroup$ But we do! See royalsocietypublishing.org/doi/10.1098/rspl.1903.0067 $\endgroup$ – DJohnM Oct 13 '19 at 22:28
  • $\begingroup$ Note that we here on earth are protected by earths magnetic field, so comparing our experiences to those who don't have such protection is a little problematic. $\endgroup$ – Kyle Kanos Oct 13 '19 at 23:20
  • $\begingroup$ Ahhh, yes, the early 20th century when you could just have multiple milligrams of radium and write papers about irradiating yourself. $\endgroup$ – ikrase Oct 14 '19 at 0:26
  • $\begingroup$ You may wish to estimate the flux of these particles hitting the retina, and compare to the flux of photons in a bright room, or the dark current (thermally activated photoreceptors) of the eyes in the absence of light. $\endgroup$ – Raghu Parthasarathy Oct 14 '19 at 4:10
  • $\begingroup$ @KyleKanos please consider cloud chamber table experiments; they prove that some particles pass through magnetic field $\endgroup$ – Dims Oct 14 '19 at 8:56

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