race and civil rights with professor dave tao. and world war ii with historian alex kershaw. sunday at 9:00 p.m. eastern, after word with natalie wechsler, author of the knowledge gap. students often score lower theuse they do not have background knowledge of vocabulary to understand a reading passage. that has been a big problem. >> watch book tv every weekend on c-span2. this morning, pacific legal foundation's senior attorney jonathan wood and defenders of wildlife's jason rylander discussed changes to the endangered species act. later, bloomberg news reporter mario parker looks at the