What are two things that are good on their own but bad when combined? And bad things that are good when combined?

avidseeker@lemmy.world to Ask Lemmy@lemmy.world – 128 points –

I just learned about "Salt (NaCl) is actually a combination of a highly poisonous gas (Cl) and a hazardous metal (Na)".

I'm sure there are lots of examples in life that this rule also applies to.

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What!? Onions with gravy on them, and gravy with onions in it, and onion flavoured gravy are three of my favourite things!