Photography
Anything, there are very few things in this world that do not interest me (apart maybe from royalty news...)
While still in High School, a friend sent me a TED video. I watched it, went to the next vid and ended up spending hours on TED. Now, I often share TED vids on Facebook for friends and with my mother through e-mail. In my opinion, the great thing about TED is that it allows anyone to stay somewhat up-to-date with the latest developments, without requiring extensive study or even large amounts of time. This is especially relevant to me, because I no longer get any "real" science since going to uni and TED is my way of filling that gap.
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A reply on Talk: Pamela Meyer: How to spot a liar
A comment on Talk: Josette Sheeran: Ending hunger now
Paradoxally, mostly because they have to if they want to survive. In Sub-saharan Africa, there's no social security system whatsoever to speak off. That means if you can't provide for yourself, you need someone who will. The state can't/won't, the institutions can't (she references mosques and churches, the typical almsbearers), therefore you only have your family to rely on. While with illness you could try to rely on your siblings/parents, you don't have that "luxury" when you're old. Then you need children to support you and the more the better (a typical commons dilemma - http://en.wikipedia.org/wiki/The_Tragedy_of_the_Commons).
The 2nd cause has been often stated in comments already - family planning (and, deeply entwined, male dominance).
A reply on Talk: William Ury: The walk from "no" to "yes"
That said, I'm glad Ali ibn Abu Talib said it, because else we probably wouldn't have known it.
A reply on Talk: Lisa Margonelli: The political chemistry of oil
A reply on Talk: Seth Priebatsch: The game layer on top of the world
If that's the case, then yes, I'd say it's possible. I can only take myself as example: I go to school 7 hours a day, sleep 8 hours, add another 2 hours for staying in shape and you've got 17 hours out of 24. That leaves 7 for games and going out. Of course, it helps that I live with my parents and don't have to do many chores.
I'd even say that "gamers" have more of a social life than those that watch tv 6 hours a day. The stereotype of the fat, lonely nerd is no longer true. Most "gamers" are normal people that go out, have parties, girlfriends, dates, etc... but above that, they keep in touch with their friends even when they no longer see each other (job change, moved to different town, etc) because they communicate while gaming.
A reply on Talk: Seth Priebatsch: The game layer on top of the world
A reply on Talk: Ellen Gustafson: Obesity + Hunger = 1 global food issue
A reply on Talk: Ellen Gustafson: Obesity + Hunger = 1 global food issue
A reply on Talk: Ellen Gustafson: Obesity + Hunger = 1 global food issue
A reply on Talk: Juan Enriquez: Using biology to rethink the energy challenge