Explore simple machines and the physics of motion in this interactive online game. Drag missing parts of a kinetic sculpture into place to move a ball from the start to the finish line. Produced by TPT/DragonflyTV.

Explore this virtual kitchen and perform online experiments to solve a puzzle and get a reward. Produced by WGBH/ZOOM.

Four open spans need bridges. You’ve just been put in charge of deciding which type of bridge is best for each of those four spans. Are you up to the task? Let’s find out. Produced by WGBH/Nova.

In this geology quiz, test your knowledge of forces that shape beautiful and bizarre natural formations on our planet. Produced by WGBH/Nova.

Hear experts “pitch” for dogs, cats, honeybees, hyenas, and other smart species, then vote for your favorite. Produced by WGBH/Nova.

Listen to a variety of dog barks—from woofs to whines—and try to interpret their meaning. Produced by WGBH/Nova.

Explore 4 billion years of life on Earth. Produced by WGBH/Evolution.

Adelita is a loggerhead turtle.  Thirty years ago she was hatched on a beach in Japan.  Can you help this ancient traveler on a 9000-mile passage across the vast Pacific ocean to lay her eggs? Produced by WNET/Nature.

Explore hypotheses for why we stand up, choose your favorite, then hear what paleoanthropologist Donald Johanson thinks. Produced by WGBH/Nova.

Scroll over the map to find out about the different wolf packs of Yellowstone and learn in which of the territories of the park they roam. Produced by WNET/Nature.

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