Is it time to bring back natural philosophy?

Once upon a time, what we now call scientists were known as "natural philosophers". These were people who studied the physical universe through observation and logic, using philosophical methods and reasoning. Today, science and philosophy have gone their separate ways, with some scientists rejoicing in the split (the late theoretical physicist Stephen Hawking famously pronounced that "philosophy is dead"). This week we're asking if science and philosophy need each other, and if a reconciliation between the two would benefit both.