Mysterious tunnels in desert rocks may be the work of unknown microbes, hinting at a hidden world inside marble and limestone ...

Strange, tiny structures have been found in the rocks around the deserts of southern Africa and the Arabian Peninsula.

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In the desert areas of Namibia, Oman, and Saudi Arabia, research work has revealed unusual structures that are probably due to the activity of an unknown microbiological life form. Unusually small ...

The limestone structure served numerous purposes in its 178 years, housing a girl’s school, a World War II radio school and a school for the Franciscan Order of the Roman Catholic Church.

The zoo’s former use as a quarry that produced limestone for early structures in and around San Antonio created an ideal setting for natural-looking animal enclosures, allowing safety for ...