Zinger Key Points Gates said he would ask a time traveler about whether humans are thriving. He continues to play a pivotal role in global discussions on technology, climate change and public ...

His grandest was a mid-1960s look ahead at the year 2000, with a special focus on science and technology. How did the experts do? Decide for yourself: Following is Helmer's summary of the exercise.

This September, in Earth 2100, a dramatic ABC News 2-hour broadcast, the greatest minds across the globe will join together in a countdown to the year 2100 to tell us what we must do to survive ...