The frequency and volatility of El Nino, a weather pattern that hammers the tropical Pacific Ocean every five years or so, does not seem linked to climate change, US research shows.
There are heroes and then there are those who transcend the accolade. The late Neil Armstrong, the first person to step foot on the moon, was one of that rarest of breeds.
US President Barack Obama and astronaut Buzz Aldrin led tributes to the Apollo 11 commander Neil Armstrong, the first man on the moon, lauding him as a reluctant but true American hero.
At 9.32am on July 16, 1969, a 2,900-tonne Saturn V rocket blasted off from Kennedy Space Centre in Florida carrying the Columbia lunar command module and the dreams of a generation.