The idea is that the matter we see does not have enough gravitational pull to keep galaxies together.

VOA: special.2009.07.21

Robert E.Lee needed those roads to pull his army together quickly.

VOA: special.2009.11.05

four-man bobsled driver. "I'm just elated." "And I can't tell you how proud I am of Holcomb and the gang and for Steve to pull it together and hold it together in just his second Olympic Games.

VOA: standard.2010.02.28