Tests show that even in the first year of life, the fear of strangers develops more similarly along identical twins than fraternals.

“Your goal is to be the gray man,” says Clinton Emerson, a former Navy SEAL and trainer for the CIA and NSA who now works at the special-ops site SOFREP.

The smallest piece in the show, an Eskimo finger mask only a few centimeters high, was displayed next to a Dogon mask over five meters tall.

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