/u/phenols's posts in /r/askscience

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How can certain bacteria and viruses be deadly to one species but completely harmless to another?

3070 upvotes

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Why do people sneeze when first going into the bright sunlight or look into a glare of sunlight?

2942 upvotes

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What are the exact processes at work that allow Gallium to “poison” other metals like aluminum? I’ve seen several videos of the phenomenon, but want to understand the exact science behind it.

125 upvotes

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What is the actual life expectancy of wild predators like bears, wolves and foxes and what are their most common causes (non hunting) of death?

7 upvotes

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Why are chocolate and certain foods deadly to dogs, but completely harmless to us?

1 upvotes

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How do allergies form? Are they genetically passed or are they independently formed after fertilization?

1 upvotes

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How do iodine, alcohol and hydrogen peroxide clean wounds etc, and which truly is the best for every day cuts and scrapes?

1 upvotes

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Is it possible to see subatomic particles with visible light and how?

1 upvotes

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Are there elements that we know of that are not found naturally which would be evidence of something extraterrestrial if found in significant quantities?

1 upvotes

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Apart from hunting by humans, why do we no longer have many megafauna on earth today? Could they survive in the present climate?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How can certain bacteria and viruses be deadly to one species but completely harmless to another?	3070
Why do people sneeze when first going into the bright sunlight or look into a glare of sunlight?	2942
What are the exact processes at work that allow Gallium to “poison” other metals like aluminum? I’ve seen several videos of the phenomenon, but want to understand the exact science behind it.	125
What is the actual life expectancy of wild predators like bears, wolves and foxes and what are their most common causes (non hunting) of death?	7
Why are chocolate and certain foods deadly to dogs, but completely harmless to us?	1
How do allergies form? Are they genetically passed or are they independently formed after fertilization?	1
How do iodine, alcohol and hydrogen peroxide clean wounds etc, and which truly is the best for every day cuts and scrapes?	1
Is it possible to see subatomic particles with visible light and how?	1
Are there elements that we know of that are not found naturally which would be evidence of something extraterrestrial if found in significant quantities?	1
Apart from hunting by humans, why do we no longer have many megafauna on earth today? Could they survive in the present climate?	1