sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: How do corn plants fight off attack?
 sentence 2: How do plants fight off disease? Do they have anything analogous to a basic immune system? sentence 1: What are some mind blowing facts about currency around the world?
 sentence 2: What are some amazing facts about world currencies?
not same meaning
same meaning
same meaning