No, in other words we don't have a need for people to be in contact with us 100% of the time. That doesn't perclude us from employment, or from having a family or having friends. If I'm not home, it's usually because I'm doing something, and people don't need to bother me when I'm doing something.
There are attacks linked to your mouse buttons, you can click the monsters to attack them, or if you hold shift and click you can attack anywhere. You can also use the skills on your hotbar by pressing the button for that skill, which will cause an attack where your mouse is located.
Mice are like other hand tools, everyone likes a different hammer because it feels right in their hand. Your best bet, if you can, is to go to a store where they have some that you can get your hands on and see how you like them yourself. No one can tell you if you're going to like a mouse, only that they do.
I thought it was fairly well known that the US wasn't the leader in internet service. It depends on which countries we're talking about though whether they're faster or slower than the US.
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http://www.youtube.com/watch?v=Lw-s5ugpp8U
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Runes are no longer found items, they get unlocked by level, you can look at the progression on the new pages on the official site:
http://us.battle.net/d3/en/class/barbarian/progression
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http://dailyinfographic.com/wp-content/uploads/2011/02/the-beauty-of-infographics.jpeg