The current approach to treating Ebola is makeshift, at best. A doctor shares the reality of life on the humanitarian frontline in Liberia, while Bill Gates calls for a new approach to treating epidemics.

Doug Menuez began photographing Steve Jobs in 1985, and then he spent 15 years immersed in the booming world of Silicon Valley innovation. Take a step back in time to see young titans in action.

To truly understand human history, David Christian wants you to take a step back — 13.7 billion years back. We asked Christian about the impact that his wide-lens concept of Big History has made since his 2011 TED Talk.