Putting the jetliner down into the placid Hudson River probably helped him keep the plane level.

CNN: Previous jet ditchings yielded survival lessons

In London, Picarro will place analyzers on the ground around the city as well as one on a bus to measure carbon emissions at road level and another on a plane to gauge emissions at higher altitudes.

FORBES: Going For The Green: Measuring The London Olympics' Carbon Footprint

Visitors can see the falls from many vantage points: above from a helicopter or microlight fixed wing plane, at eye level walking across the Knife Edge Bridge that spans the width of the falls on the Zambian side, or from below on a hike.

BBC: Livingstone��s Zambia

As the battery explosions earlier this month demonstrate, the idea that these computerized controls would make the lithium-ion batteries safe for a plane flying 40, 000 feet above sea level filled with passengers is inadequate.

FORBES: MIT Professor: Battery Fix Could Ground 787 Until 2014

While the park has added newer amusements, most visitors come for the vintage attractions, including a two-tier carousel built in 1921, the Talaia, which raises guests with a rickety metal arm to a height of 550m above sea level, and the iconic Avio ride, modelled on the first plane to fly between Barcelona and Madrid.

BBC: Europe��s grand old theme parks

For these reasons, we at the Center for Security Policy are convinced that the National Aerospace Plane must become a high profile, "national" program funded at a level determined by the maturity of the associated technology.

CENTERFORSECURITYPOLICY: The National Aerospace Plane