There was a new system of liquid nitrogen to keep the pilot cool and to resist the crushing force of gravity at high speeds.

VOA: special.2010.07.07

They have found that lack of gravity has a severe effect on bones.

VOA: special.2009.03.10

So the Pentagon awarded a 4-billion-dollar contract to build a version with a lower center of gravity and improved suspension.

VOA: standard.2010.08.01

And my center of gravity is a little bit lower." "I feel like sometimes it is a little more difficult to knock me down.

VOA: standard.2010.02.09

Analysts say that even if the G20 leaders do not agree on all points, it is crucial that they send a message to the public and to jittery markets that they understand the gravity of the crisis and that they are committed to working together to try to resolve it.

VOA: standard.2009.04.02