in a recent story on global shipping, we overextended the wait times, the average time for a ship to wait in transit through the canal was 25.66 hours. thanks to all of you for being part of my program this week. i will see you next week. >> hello, everyone. i'm fredericka whitfield. these stories topping the "newsroom," a downed sightseeing helicopter and rescue operation on the hudson river. the intense heat in the west is only getting worse and really dangerous. a report from one of the hottest places in this world next. president barack obama visited robben island today, the prison where nelson mandela was held for 18 years.