PTELook at the text below. In 35 seconds, you must read this text aloud as naturally and clearly as possible. You have 35 seconds to read aloud.

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Beginning in 35 seconds.

Particles can act like clumps of matter or ripple through space like waves, and they can even exist in two places at once. A new device harnesses this strange quantum behavior to measure Earth ’ s gravity. Slight changes in gravity from place to place reveal changes in the density of material beneath the sensor. This allows the instrument to detect underground objects.

PTERead Aloud: #947

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