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[[Image:Niels stensen.jpg|thumb|Niels Steensen]]

[[Image:Niels stensen.jpg|thumb|Niels Steensen]]

'''Niels Steensen''' or '''Nicolaus Steno''' (1639-86) was a Danish scientist and theologian who is famous for his significant breakthroughs in especially [[anatomy]] and [[geology]]. He was the first to study the human [[heart]] scientifically and to discover that it is a [[muscle]], and he examined the human brain and criticized earlier descriptions of its parts and their functions.

'''Niels Steensen''' or '''Nicolaus Steno''' (1639–86) was a Danish scientist and theologian who is famous for his significant breakthroughs in especially [[anatomy]] and [[geology]]. He was the first to study the human [[heart]] scientifically and to discover that it is a [[muscle]], and he examined the human brain and criticized earlier descriptions of its parts and their functions.

In the field of geology, he formulated several pioneering theories relating to the study of ''strata'', i.e. layers in soil or rock, and described how such layers would form chronologically through sedimentation. He also studyed [[fossil]]s, in particular suggesting a theory that could describe the process of [[fossilization]] through chemical changes.  

In the field of geology, he formulated several pioneering theories relating to the study of ''strata'', i.e. layers in soil or rock, and described how such layers would form chronologically through sedimentation. He also studyed [[fossil]]s, in particular suggesting a theory that could describe the process of [[fossilization]] through chemical changes.