In this interactive, see how closely parts of your body match those in other animals, from sharks to fruit flies. Produced by WGBH/Nova.

Explore the stages of two types of cell division, mitosis and meiosis, and how these processes compare to one another. Produced by WGBH/Nova.

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.

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 what the skeleton of the bizarre Ice Age predator Thylacoleo reveals about how it lived. Produced by WGBH/Nova.

A body has been discovered. Collect and analyze the evidence, then determine the postmortem interval (PMI). Produced by WNET/Nature.

How do researchers read the tiny A’s, G’s, T’s, and C’s that comprise DNA? Find out in this step-by-step interactive. Produced by WGBH/Nova.

Immense optical and radio telescopes now in the works promise to make astonishing discoveries about the cosmos. Produced by WGBH/Nova.

See how a human embryo develops the key characteristics that make it male or female. Produced by WGBH/Nova.

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