Talk very briefly about innovation cycles, things that grow, have a lot of activity; they die out when they're replaced by something else. 简短地谈一下发明创造的周期，周期发展时会衍生许多活动，当这些活动被其他活动取代，此周期就灭亡了。 These things
As Congress returns to work, the President calls on them -- and all of us -- to debate our differences vigorously but to live up to the spirit of common cause we felt following the tragedy in Arizona.
Some advantages, particularly to this age, are not to be denied. Boredom seems to have been "vanquished"! There is always something to do, but hasn't this translated into a perpetual dis
