Dr. Puzzle
Meet the sudoku master
Meet the sudoku master
Three young Americans stop at nothing to halt one of Asia's biggest killers
Peering into the crystal ball
Ninety-three and still pumping
As you get older you get happier. No, really
Can the system keep up with demand for new hips and knees?
What your mom ate as a child could give you a stroke in middle age
One man's quest to lengthen life by cutting calories
Stem cell research offers clues -- but don't hold your breath
The field grows up