1.   Hardly any lunar rocks are younger than three billion years.

2.   In general, lunar rocks differ from terrestrial rocks in that the Moon contains much lower concentrations of easily vaporized elements.

3.   None the less, it is good to keep in mind that very few geochemists expect water to be found in lunar rocks.

4.   Schemes for extracting oxygen from lunar rocks usually feature melting or chemically destroying the principal minerals in the rocks and regolith.

5.   Inside each one are steel boxes containing the lunar rock samples, none of which has ever been taken outside this room or its predecessor facility.

6.   Lunar rock samples contained no hint of water.

7.   The sixth floor, for teen-agers, displays objects donated by NASA, like lunar rocks and small components from space shuttles.

8.   There the fragments will be preserved, archived alongside the lunar rocks gathered by the Apollo astronauts and parceled out to scientists for analysis.

9.   Professor David Block of the University of the Witwatersrand presented Mandela with a sample of lunar rock flown to South Africa from the United States for a special exhibition.

10.   The lunar rock studies suggest that the moon was formed from material from the Earth, from the planet that hit Earth or from a combination of the two.