Focusing is mental activity, not physical.

Mental activity is a subset of physical activity.

This has to be the most retarded thing I’ve read all year. There is nothing physical about writing a test for 4 hours.

	▲	runarberg 20 hours ago \| parent [-]
		> When disagreeing, please reply to the argument instead of calling names. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3." https://news.ycombinator.com/newsguidelines.html