Headphones if the earbuds are the "standard" stick-in-you-ear type with nothing holding them in, I find earbuds without anything over my ear tend to fall out easily (may just be my experience/weird ears, but that is what happens to me). Although headphones would most likely have better sound quality, durability, etc. I rather not try to hide those in class while listen to music
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WYR have a very fast duck that cannot fly or a very slow duck that can fly (no you cannot kill it, shoot at it, eat it, etc.)?