It's been slow, but it's there. It's noticeable when you compare it to a past generation.

People spend more time at work and have more friendships and interactions there than they would have had in the past. To some extent it replaces other kinds of friendships that people would have had outside of work.

If we could compare ourselves to similar people 30 or 40 years ago, we would see a big difference. That is a negative aspect of our social relations today.

Over the past 30 years, our studies have demonstrated a strong relationship between journal article citations and peer esteem, and this is reflected in professional awards like the Nobel Prize.

I know no way of judging the future but by the past.

I've been to Africa many times in the past 20 years, but I can't believe this is the first time since the very first Red Nose Day, that I've been back to Ethiopia. The last time I was here was just after the famine and it was crazy, there were people all over the place, kids without families, aid workers, camera crews.