1) (Video: Underwater Mystery Circle) Why do pufferfish make nests even though it is hard work?
2) What are some of the bad things about the sugar 3D printer?
3) How does the microneedle patch work?
4) How does the Ark Hotel provide energy? Why does energy need to be made like that?
5) How is the Armadillo-T more efficient than a car?
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