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The evolution of venom is turning out to be one of the most intriguing and well-understood stories in evolution. But there are still surprises--like how a venom ended up being made inside a snake's brain.

http://phenomena.nationalgeographic.com/2013/01/09/on-the-origin-of-venom/
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Ralph Stoever's profile photoAung Thiha's profile photoLasse Bjørn Karlsson's profile photoMichael Ross Murphy's profile photo
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I was initially surprised that tetrodotoxin (puffer fish, blue-ringed octopus, and other creatures) was omitted, but I suppose that is because tetrodotoxin is thought to be generated by bacteria within the  venomous host, and thus wouldn't have evolved in the host genome?
 
Interesting about the limitations of killing something quickly.

-Not sure if you can fix it quick:
10nth paragraph: "…that zero on on the same…"-
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