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

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If medical grade masks filter to 300 nanometres (N95 - 0.3 microns) then aren't they pointless to use to block viruses that are normally much smaller then this?

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Every ton of coal requires 2 tons of oxygen in order to burn. If the usable coal reserves of 1.1 trillion tons end up being used what will be effects of burning 2.2 trillion tons of oxygen?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If medical grade masks filter to 300 nanometres (N95 - 0.3 microns) then aren't they pointless to use to block viruses that are normally much smaller then this?	1
Every ton of coal requires 2 tons of oxygen in order to burn. If the usable coal reserves of 1.1 trillion tons end up being used what will be effects of burning 2.2 trillion tons of oxygen?	1