Take the top path until you reach a lift. Ride it to the highest level, then continue to the right, and you’ll come to a room with a dark cluster of ground that rumbles when you walk over it. Jump and ...

Liquid crystals are substances that flow like a liquid but maintain some of the ordered structure of crystals. Liquid-crystal molecules tend to be elongated and to orient in specific directions.

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In the early 1900s, Wilson A. Bentley sent 500 prints of his snowflakes to the Smithsonian to ensure their safety for the future. The images are now part of the Smithsonian Libraries and Archives.