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

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Why is chlorophyll green? Isn't there a more energetically favorable color?

584 upvotes

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Spacecraft use planetary gravity assists to increase speed. But where does the energy come from? How can the Spacecraft gain velocity?

11 upvotes

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Why does water look blue?

2 upvotes

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What is a rimshot on a drum? How is it so much louder than a normal stroke? Is it a mini sonic boom like a whip-crack?

1 upvotes

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Commensal organisms are essential for life and make up (by cell count) the majority of us. How long would a commensal-free person live?

1 upvotes

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Is it more efficient/eco friendly to use a wood burning fire or a space heater to heat an average living room?

1 upvotes

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Is there any scientific evidence that telekinetic abilities are possible?

1 upvotes

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I was testing LEDs with a variable power supply and found this amazing phenomenon. When I touch both terminals while either is connected to a ground, the LED illuminates. Why is this?!

1 upvotes

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I don't get any bug bites. Mosquitoes bite me sometimes but no marks or irritation. Not even ants. It's like my super power. Why could this be?

1 upvotes

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Is there a microscope that can perform both phase contrast and dark field microscopy?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why is chlorophyll green? Isn't there a more energetically favorable color?	584
Spacecraft use planetary gravity assists to increase speed. But where does the energy come from? How can the Spacecraft gain velocity?	11
Why does water look blue?	2
What is a rimshot on a drum? How is it so much louder than a normal stroke? Is it a mini sonic boom like a whip-crack?	1
Commensal organisms are essential for life and make up (by cell count) the majority of us. How long would a commensal-free person live?	1
Is it more efficient/eco friendly to use a wood burning fire or a space heater to heat an average living room?	1
Is there any scientific evidence that telekinetic abilities are possible?	1
I was testing LEDs with a variable power supply and found this amazing phenomenon. When I touch both terminals while either is connected to a ground, the LED illuminates. Why is this?!	1
I don't get any bug bites. Mosquitoes bite me sometimes but no marks or irritation. Not even ants. It's like my super power. Why could this be?	1
Is there a microscope that can perform both phase contrast and dark field microscopy?	1