containment cap. it could put an end to the flow of oil from the rub chured well. bp has replaced a leaking piece of equipment that delayed the test. argentina is the first latin american country to legalize same sex marriage. the measure cleared argentina's senate after hours and hours of debate. it also gives gay couples the right to adopt children. former vice president dick cheney is recovering from heart surgery in a virginia hospital. he had a small pump place in his heart to improve its function. he's had a series of heart attacks. to make the journey from wonder to discovery again and again. the science of chemistry, our guide. a periodic table that includes the human element, our conscience. and to make this journey, we have become the new order of hunters and gatherers