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This week, PopSci took a look at re-shaping the hot dog — a notorious choker of children, apparently — as well as an affordable new sort of toilet.

Japan unveiled a new robot, AGAIN. This one is modeled on the hummingbird, and can hover in place on its four tiny wings.

And we went to the gym, future-style.

Leave a comment to win the shirt. We’ll announce our randomly chosen winner next week. If you can’t wait, buy the shirt here.

Enjoy our past Weeks in the Future here.