Things You Have Always Wondered…

I read once that dogs (pretty sure it was dogs) are colour blind. How the fuck do we know that?
I can understand a dog being colour blind, I assume because their eyes can't see as many wavelengths as we can (like we can't see UV or IR whereas some animals can), but I read somewhere that dogs see in black and white, which I don't believe. T'internet eh, it's 99.9% bollox spouted in an authoritative manner.

As to how we know that? fuck knows
 
How people who believe in one specific religion are always born and raised where people who believe in that specific religion already live.

Is it a genetic trait or an unshakable personal belief?
 

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