11.   David Clark Co., which makes the orange suits that shuttle astronauts wear during takeoff, has also built a Mars concept suit, the D-suit.

12.   Cosmonauts sleep in baglike restraints similar to those used by shuttle astronauts.

13.   Currently, NASA relies on two approaches to protect shuttle astronauts.

14.   During their visit, the shuttle astronauts also repaired an American external cargo crane and replaced a faulty NASA communications antenna.

15.   Earlier Saturday, the shuttle astronauts accomplished the last of their mission objectives, the deployment of a glittering student science satellite called Starshine.

16.   Fortunately, the orbiting telescope was designed for regular upgrades by visiting shuttle astronauts.

17.   Glenn will also join his crewmates in eight other experiments that have been conducted on previous shuttle astronauts.

18.   Had shuttle astronauts been required to make an emergency spacewalk, they would have used a chisel and a hacksaw to penetrate it.

19.   He is a veteran shuttle astronaut.

20.   However, a puzzling problem with a dish-shaped communications antenna aboard Discovery has prevented the shuttle astronauts from transmitting live video since blasting off two days ago.