<?xml version="1.0" encoding="UTF-8" standalone="yes"?><oembed><version><![CDATA[1.0]]></version><provider_name><![CDATA[Azimuth]]></provider_name><provider_url><![CDATA[https://johncarlosbaez.wordpress.com]]></provider_url><author_name><![CDATA[John Baez]]></author_name><author_url><![CDATA[https://johncarlosbaez.wordpress.com/author/johncarlosbaez/]]></author_url><title><![CDATA[Extremal Principles in Classical, Statistical and Quantum&nbsp;Mechanics]]></title><type><![CDATA[link]]></type><html><![CDATA[Mike Stay has some more thoughts on extremal principles.]]></html></oembed>