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

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How are "unhealthy" activities - like smoking, etc - that raise your heart rate different physiologically from "health" activities - like taking a walk? Does your heart get a workout either way?

249 upvotes

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Why is wood ash so basic?

9 upvotes

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What is the lowest order of animal we know of that engages in "play" - or activity for its own sake?

5 upvotes

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Are all arachnids obligate carnivores?

4 upvotes

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Are there any other animals that care for their young as long as humans? Typically 12-18 years?

1 upvotes

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What IS the air speed velocity of an unladen swallow, both African and European? How much weight can each species carry and remain aloft?

1 upvotes

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Why did no other bird step into the passenger pigeon's ecological niche?

1 upvotes

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Could a theoretical hive world, supporting a population of almost a trillion, get by without importing food?

1 upvotes

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Have we ever seen a star die?

1 upvotes

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Why isn't the New York City sewer and subway system lousy with snakes?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How are "unhealthy" activities - like smoking, etc - that raise your heart rate different physiologically from "health" activities - like taking a walk? Does your heart get a workout either way?	249
Why is wood ash so basic?	9
What is the lowest order of animal we know of that engages in "play" - or activity for its own sake?	5
Are all arachnids obligate carnivores?	4
Are there any other animals that care for their young as long as humans? Typically 12-18 years?	1
What IS the air speed velocity of an unladen swallow, both African and European? How much weight can each species carry and remain aloft?	1
Why did no other bird step into the passenger pigeon's ecological niche?	1
Could a theoretical hive world, supporting a population of almost a trillion, get by without importing food?	1
Have we ever seen a star die?	1
Why isn't the New York City sewer and subway system lousy with snakes?	1