7

No, you can't catch a cold from plants. You can, however, inhale lots of grass pollen because... we would run around and lots of dried grass dust would get kicked up. The second clue it's a pollen allergy is the short nature of it. Colds last longer than 24 hours. http://www.nhs.uk/conditions/Cold-common/Pages/Introduction.aspx


2

To answer this question as to why some 35% of people may experience the photic sneeze reflex requires knowledge of how the photic reflex occurs and its function, and both are currently unknown. It may be a neutral trait, or it may even have some evolutionary advantage. It's known now that simulating a sneeze by passing fast moving air over nasal cilia ...


1

Whatever you do, make sure you cover your mouth with e.g. the inside of your elbow. Spreading bugs is a) bad, and b) impolite. See this CDC webpage for more information.


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