http://www.evolutionnews.org/2011/01/peer-reviewed_pro-intelligent042261.html On this episode of ID the Future, Casey Luskin reports on a 2009 peer-reviewed paper arguing for the irreducible complexity of two systems vital to bird flight - feathers and the avian respiratory system. The author, Leeds University professor Andy McIntosh, challenges his critics to consider the design hypothesis as a valid scientific assumption "borne out by the evidence itself."