/u/K931SAR's posts in /r/askscience

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A friend photographed a huge "smoke ring" in the sky over Portland OR this morning (photo inside). Can anyone shed light on what might have caused it?

652 upvotes

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Is the caffeine content of cold-brewed coffee different from that of hot-brewed?

5 upvotes

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Aluminum foil, baking soda, salt, dish detergent and water jewelry cleaning recipe - what does the aluminum foil do in this context?

2 upvotes

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Is there any truth to the old tale that odors resulting from bacteria on clothes are better reduced by hanging outdoors than be machine drying?

2 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
A friend photographed a huge "smoke ring" in the sky over Portland OR this morning (photo inside). Can anyone shed light on what might have caused it?	652
Is the caffeine content of cold-brewed coffee different from that of hot-brewed?	5
Aluminum foil, baking soda, salt, dish detergent and water jewelry cleaning recipe - what does the aluminum foil do in this context?	2
Is there any truth to the old tale that odors resulting from bacteria on clothes are better reduced by hanging outdoors than be machine drying?	2