How do girls show interest in a guy?

roadbiker
So say you're walking down a street, or in the library or in the shop, and you see an attractive guy, what body languages cues do you give to indicate this? I'm asking this as girl rarely approach girls and it's better to approach a girl that wants to be approached.

Do girls smile at strangers or do they just give the 'checking you out' stare and hopefully the guy approaches if he likes her?
How do girls show interest in a guy?
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