The global shadow economy — unreported, untaxed activity — is estimated at about 28% of global GDP.
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The Mayans developed a complex calendar system.
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The Roswell incident sparked decades of extraterrestrial speculation.
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Nothing can travel faster than light in a vacuum.
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Nothing can travel faster than light in a vacuum.
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Your mind interprets signals.
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Sinkholes can form when underground rock dissolves.
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Attention can be limited and easily distracted.
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Sleep plays a critical role in memory consolidation.
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