A dragonfly has a life span of 24 hours.

A goldfish has a memory span of three seconds.
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These r both wrong.

I had a pet dragonfly for 5 days when I was younger. It was one of those big guys. my friends & I use to sit outside catching food for it.

& the goldfish one is sooo wrong its stupid. If a goldfish had a 3 second memory, then how do they know ur shape & when they see u its food time???

This was also proven to be a myth on Mythbusters.

I didn't read the rest of them, so I have no comment on them yet.