Are we born to be optimistic, rather than realistic? Tali Sharot shares new research that suggests our brains are wired to look on the bright side -- and how that can be both dangerous and beneficial.

In the 20th century we added an unprecedented number of years to our lifespans, but is the quality of life as good? Surprisingly, yes! Psychologist Laura Carstensen shows research that demonstrates that as people get older they become...