CR4 - Recent Blog Entries https://cr4.globalspec.com/browse/allblogs Copyright 2026 Thu, 01 Oct 2026 04:00:00 EST https://cr4.globalspec.com <![CDATA[Breaking up a horseshoe (Oct. 2026 Challenge Question)]]> Thu, 01 Oct 2026 04:00:00 EST Challenge Questions <![CDATA[QAADS 2016: Plastic Materials Making Flight Light]]> Fri, 11 Sep 2026 04:00:00 EST QGuy Aerospace Blog <![CDATA[The Line Illusion (September 2026 Challenge Question)]]> Mon, 31 Aug 2026 04:00:00 EST Challenge Questions <![CDATA[Chess Test (August 2026 Challenge Question)]]> Fri, 31 Jul 2026 04:00:00 EST Challenge Questions