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

However, limestone ultimately has a less pronounced style than quartzite, which make it a great option for traditional or minimalist designs. Quartzite offer a similar look as marble or granite ...

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 ...

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