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

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How do house spider survive on little to nothing to eat? Do they have some kind of super metabolism? "standby mode"?

1139 upvotes

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Do insects "play"? what about fish, reptiles, birds? What is the least complex form of life which has been observed to exhibit play-like behavior, or is it only seen in mammals?

406 upvotes

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What is happening when people furrow their brow when concentrating? Is it a learned behavior / does it actually increase brain activity?

24 upvotes

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What % of mass of a human body is bacteria/non-host cells? Where are all these organisms?

5 upvotes

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If light behaves as a wave and a particle, why don't two intersecting light beams interact with each other?

2 upvotes

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What material on my sneakers makes them fluoresce in the shade (GIF in comments)?

1 upvotes

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Is there any scientific understanding of how fact-based memories are stored compared to other types of memories?

1 upvotes

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On the news this morning it was reported that heartbeats were detected beneath the rubble in Beirut after the large port explosion last month. How exactly are heartbeats detected below a crushed building?

1 upvotes

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Do metric countries use imperial units in aviation flight levels?

1 upvotes

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What is the carbon footprint of the mining of a bitcoin?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How do house spider survive on little to nothing to eat? Do they have some kind of super metabolism? "standby mode"?	1139
Do insects "play"? what about fish, reptiles, birds? What is the least complex form of life which has been observed to exhibit play-like behavior, or is it only seen in mammals?	406
What is happening when people furrow their brow when concentrating? Is it a learned behavior / does it actually increase brain activity?	24
What % of mass of a human body is bacteria/non-host cells? Where are all these organisms?	5
If light behaves as a wave and a particle, why don't two intersecting light beams interact with each other?	2
What material on my sneakers makes them fluoresce in the shade (GIF in comments)?	1
Is there any scientific understanding of how fact-based memories are stored compared to other types of memories?	1
On the news this morning it was reported that heartbeats were detected beneath the rubble in Beirut after the large port explosion last month. How exactly are heartbeats detected below a crushed building?	1
Do metric countries use imperial units in aviation flight levels?	1
What is the carbon footprint of the mining of a bitcoin?	1