Human life expectancy dramatically increased last century. Compared to babies born in 1900, those born at the turn of the 21st century could live, on average, three decades longer—with many living to celebrate their 100th birthdays. In other words,

A new study reveals that scientists successfully used human stem cells to patch a hole in a monkey's retina, restoring the primate's vision and marking a successful step forward in the quest to treat age-related vision loss. The study, published this