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

In the memorial, there is the X-1, the first airplane to fly faster than sound.

VOA: special.2010.07.07

When he is clear of the B-52, he starts the X-15's rocket engine.

VOA: special.2010.07.07

Pilot Scott Crossfield is in the X-15's only seat.

VOA: special.2010.07.07

The work is called "2 x 4 Landscape."

VOA: special.2009.05.06

A less invasive procedure known as a virtual colonscopy is done with a CT scan that passes x-rays through a patient's abdomen.

VOA: standard.2010.04.07