Well it's interesting that it makes regular ringing/metallic sounds when it's dropped(at least in the movies), so it is not inelastic. Which means it could be deformed if placed under extreme force but it would always spring back into shape. So I think it might be the world's most powerful spring.
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I feel like people criticizing Duolingo for being inferior to talking with native language speakers or a traditional language class are kind of missing the point. It's like saying 10 minutes of slow walking is inferior exercise to an hour of HIIT every day. Yeah true but people actually use Duolingo. The whole point is that it is fun and doesn't feel like a chore. It's probably why so many people around the world have learned English by watching American and British TV shows. Is that an optimal learning method? No, but the best exercises are the ones you actually do.