President-elect Barack Obama has chosen a highly experienced, pragmatic A-team to run U.S. national security during his administration. He appears to have opted for forceful, passionate individuals who can be expected to clash on some key issues. The talent level looks high. But the dangers of serious collisions between key individuals on major policy issues down the road are already clear.

Hollywood actor Keanu Reeves has agreed to join Caltech researchers on a panel to discuss his new movie "The Day the Earth Stood Still," organizers said.

President-elect Barack Obama has chosen a highly experienced, pragmatic A-team to run U.S. national security during his administration. He appears to have opted for forceful, passionate individuals who can be expected to clash on some key issues. The talent level looks high. But the dangers of serious collisions between key individuals on major policy issues down the road are already clear.