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What are the most important inventions of the 21st century?
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1.  The smartphone is one of the most significant inventions of the 21st century.
2.  Virtual reality (VR) technology has also been a major breakthrough in recent years, with many people now using VR headsets to experience immersive experiences.
3.  Artificial intelligence (AI) and machine learning have become increasingly popular as well, with AI-powered applications being used by businesses across the world.
4.  Biometrics such as facial recognition and fingerprint identification technologies have also seen widespread use in recent years, providing greater security for individuals and businesses alike.