It's a long-held idea that turtles can tuck their heads into their shells when threatened. But is it true? And is this protective trick why turtles the world over have shells today? The answer is that ...

The third Russian turtle tank. Russia’s “turtle tank”—an old T-72 with a drone-resisting armored shell installed on top of it—wasn’t a one-off. The Russians clearly are building a host of turtle tanks ...