The Edison2 is an experimental car that was one of the winners of the ten-million-dollar Progressive Insurance Automotive X Prize.

VOA: special.2010.11.17

It carried the man who became the first human to step on the moon, Neil Armstrong, a former X-15 pilot.

VOA: special.2010.07.07

Some of their work involved X-rays produced by particle accelerators, devices that bring atomic particles into high energies.

VOA: special.2009.12.08

The National Osteoporosis Foundation says a test called Dual-energy X-ray absorptiometry,or DXA, is the best test for osteoporosis.

VOA: special.2010.08.31

The first plane ever to fly faster than the speed of sound was the X-1 in nineteen forty-seven.

VOA: special.2010.07.07

But he says he felt the greatest satisfaction when a thirteen-year-old painted the word "gun" and then put a big "X" through it.

VOA: special.2009.06.01

John Singer Sargent's painting known as "Madame X" was disputed when it was shown in eighteen eighty-four.

VOA: special.2010.08.04

After a few seconds, when the X-15 was safely away, the pilot started its rocket engine.

VOA: special.2010.07.07

James Patterson's "Maximum Ride" and "Daniel X" series have become best sellers in the United States.

VOA: special.2009.10.12

The X-15 was the first major investment by the United States in manned space flight technology.

VOA: special.2010.07.07

One of them,the Apollo-11, traveled to the moon just seven months after the last X-15 flight.

VOA: special.2010.07.07

D'Arcy plans to use the letter to embarrass Madame X's husband and destroy his political power.

VOA: special.2009.12.26

He died long before the search for Planet X resulted in the discovery of Pluto.

VOA: special.2010.07.11

The first proposal for this new research vehicle, the X-15, was made in nineteen fifty-four.

VOA: special.2010.07.07