1.   ...carbon molecules with unusual chemical and catalytic properties.

2.   Carbon molecules previously were known to exist only as soft, slippery graphite, and hard, crystalline diamond.

3.   Complex carbon molecules, including some that play roles in life, have been found in relatively small rocky meteorites.

4.   If they survive the trip to the ground, the carbon molecules in their interiors often remain intact.

5.   Pizzarello also detected large numbers of soccer-ball-shaped carbon molecules known as buckyballs.

6.   Scientists examining the layer of sediment corresponding to the die-offs discovered concentrations of the sturdy, soccer ball-shaped carbon molecules known as buckminsterfullerenes, or buckyballs.

7.   Such work was highlighted last month, when IBM said it had built a logic circuit from tiny tubes of carbon molecules, or nanotubes.

8.   The breakthrough in nanotechnology came several years ago with the discovery of the nanotube, a carbon molecule of enormous strength.

9.   The researchers have also found soccer-ball-shaped carbon molecules known as buckyballs in the layer of rock corresponding to the extinctions.

10.   The Rice group replaced the whisker generally used in such microscopes with an ultrathin carbon molecule similar in structure to buckyballs.