We asked Professor Paul Bracken, an expert in nuclear strategy, what’s behind the posturing and what test explosions would mean for the world.

In the most talked-about film from the final year of the 20th century, "The Matrix," a computer hacker named Neo finds that ...

This is an age simulation suit, designed to replicate what it feels like to be 80 years old. It includes goggles that blur ...

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Is everything we see, feel, and experience not real? Plato already proposed this theory with his myth of the cave. For ...