I sent a student to have his temperature taken because he wasn't feeling well.  I thought it would be a good teachable moment...

Mrs. B:  Can anyone tell me what a normal, healthy human being's temperature should be?

Lily:  98.6 degrees Fahrenheit!

Mrs. B:  Yes, that's right!  So if Cody has a fever, his temperature will be above 98.6 degrees.

Lily:  What if he's right at 98.6 degrees?

Mrs. B:  Then that means he's normal.

Bronson:  (Cody's best friend)  He may be 98.6 degrees, but he is NOT normal!