How can I know if my crush likes me back?

Dear Ali,

I like this boy at my school. He makes me laugh and he's really cute, but I don't know if he likes me back. What should I do to find out?
Need to Know

It's really cool that this guy makes you laugh! There are usually hints when someone really likes you. He might pay more attention to his appearance, or find little ways to be around you, or…well, you get the picture. You could try asking around—maybe someone else has noticed something. Or you could even just ask him (I almost always believe in the direct approach). But if you do, be prepared for disappointment—just in case.

 

How would YOU try to find out if your crush likes you back?