Petrified wood fossil with opal formed in the growth rings.
This looks amazing
However, if you look closely, you realize, why scale is important in pictures like this. Can you spot the human fingers in the background?
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... is a geophysicist by heart. He works at the intersection of machine learning and geoscience. He is the founder of The Way of the Geophysicist and a deep learning enthusiast. Writing mostly about computational geoscience and interesting bits and pieces relevant to post-grad life.