He turned when he heard the sound of footsteps behind him.  Nobody made a sound.

From the definition it will be clear the group is a topological invariant of X; i.e., if two spaces are homeomorphic, their fundamental groups are isomorphic.

And let thy mustie vapours march so thicke, That in their smoakie rankes, his smothred light May set at noone, and make perpetuall night.

Doc was awarded a Navy Cross after she ran through a minefield to get to an injured marine.