askscience

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When a virus like Ebola kills its host before they can spread it to others, it helps lower the R0, but does there ever come a point where the R0 drops due to decreased population density resulting from deaths? If so, what determines the tipping point?	6
When a person has seasonal allergies or an autoimmune disease, do their lymph nodes still swell like they would for an infection? Why or why not?	4
What causes some people to have a “chemical” smell in their nose after going running? (I’m not talking about sweat or “body odor” but literally a slightly caustic feeling/smell that appears to come from inside the nasal cavity.)	1
I’ve recently learned about platelets carrying serotonin. Is there any evidence that people with low platelet counts have higher incidences of things like depression that seem to be affected by serotonin levels? If so, are platelet counts something that one has any control over?	1
How would/does Bernoulli’s principle affect efficacy when wearing a respirator/face mask? Specifically, if there were a small opening in an otherwise well-fitting mask, would it be worse than having a looser fitting mask due to a stronger stream of air from the narrower space?	1
What negative or positive effects can come from a woman who is not pregnant (or trying to get pregnant) taking pre-natal vitamins?	1
How does cutting a grass affect its growth? Pruning flowers, bushes, etc. can make them more full. Do grasses experience the same changes as a result of cutting, and if not, why not?	1
Since physical/chemical skin exfoliators speed up the rate of turnover of skin cells, do they also increase the likelihood of cancerous cells?	1
How do things like car-side pickups at restaurants and things of that nature reduce the risk of spreading/getting covid-19?	1
Do LED (or incandescent) Christmas lights on trees and bushes in the winter affect plant growth?	1

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