Researchers finally measure the subtle quantum effects of fourth fundamental force.
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References
Nesvizhevsky, V. V. et al. Quantum states of neutrons in the Earth's gravitational field. Nature 415, 297 - 299 (2002).
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Clarke, T. Gravity leaps into quantum world. Nature (2002). https://doi.org/10.1038/news020114-8
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DOI: https://doi.org/10.1038/news020114-8