https://www.sciencealert.com/cells-inside-living-embryos-use-tiny-tubes-to-mail-packages-to-one-another
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11/5/23 at 9:01am
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ScienceAlert
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Felicity Nelson
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In Paris in the 1930s, letters and small parcels could be delivered via an elaborate network of underground pneumatic tubes that interlaced the city.
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