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How big would an object look at a certain distance?

I've tried looking this up and found that objects only appear smaller because of the curvature of the eye. For example: the flowers are the same size, but since the second flower is farther, angle ...
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How to phrase the question of measuring the frequency of a complex sound?

I was hoping I could crowd source some understanding. Im interested in understanding the measuring of sound pitch. From what I've been able to gather thus far- sounds are waves of air pressure and ...
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Could we recognise if time was running at a different rate for one species than another? I.e a human and an ant

My question is quite simple if time ran at a different speed for smaller creatures, how would we be able to observe this or confirm by experiment?
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Binocular vs. monocular field of view in head-up displays

I've been reading about head-up displays in Wiki: Head-up display and understand that it works such that an image from an LCD screen (automotive) or from a cathode ray tube (aviation) is projected to ...