Is staring really that clear of a sign of attraction?

I read an article on here that all a girl needs to know if a guy likes her is whether he stares or glances at her repeatedly. Is it really that simple?!

I have caught this guy looking at me from across the room a couple times. I'm not great at catching him, but my friend said that she noticed he was looking at me repeatedly while I was talking to her.

Is that seriously all I need to know if he is interested? That seems too easy!
Is staring really that clear of a sign of attraction?
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