The 11 states with bottle bills account for more than 60 percent of the PET plastic recycled in the United States.

NPR: Battle over Method Thwarts Bottle Recycling

While plastic shells are already sold commercially for pet hermit crabs, Project Shellter adds a twist by letting people worldwide design their own.

FORBES: Can 3-D Printing Save Homeless Crabs?

Nintendogs, an interactive pet romp features puppies cavorting around the screen that can be petted with a plastic pen.

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