woodruff: margaret warner examines new warnings about the long term use of osteoporosis drugs aimed at rebuilding bones. brown: and gwen ifill talks with biographer robert caro about his latest volume on lyndon johnson, an epic story of history, politics and human rivalries. you hate to use words like hatred as a historian but hatred is not too strong a word to describe the relationship between robert kennedy and lyndon johnson. they hated each other. woodruff: that s all ahead on tonight s newshour. major funding for the pbs newshour has been provided by: citi turns 200 this year. in that time, there have been some good days and some difficult ones. but through it all, we persevered. supporting some of the biggest ideas in modern history. so why should our anniversary matter to you? because for 200 years, we ve been helping ideas move from ambition to achievement. and the next great idea could be yours. and the william and flora hewlett foundation, working to sol
woodruff: margaret warner examines new warnings about the long term use of osteoporosis drugs aimed at rebuilding bones. brown: and gwen ifill talks with biographer robert caro about his latest volume on lyndon johnson, an epic story of history, politics and human rivalries. you hate to use words like hatred as a historian but hatred is not too strong a word to describe the relationship between robert kennedy and lyndon johnson. they hated each other. woodruff: that s all ahead on tonight s newshour. major funding for the pbs newshour has been provided by: citi turns 200 this year. in that time, there have been some good days and some difficult ones. but through it all, we persevered. supporting some of the biggest ideas in modern history. so why should our anniversary matter to you? because for 200 years, we ve been helping ideas move from ambition to achievement. and the next great idea could be yours. and the william and flora hewlett foundation, working to sol