"It might take the monarchs as many as four to five generations to complete the journey all the way backup to Canada," says Sarina Jepsen, who directs the endangered species program for the Xerces Society.
When a user stares at one of the checkerboard patterns, electrodes on the back of his head pick up the resulting brain signals and are sent to a computer software program.
当用户凝视棋盘的格子时，在他的后脑勺电极收到大脑产生的信号，并传送到计算机软件程序。
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When all map tasks and reduce tasks have been completed, the master wakes up the user program. At this point, the MapReduce call in the user program returns back to the user code.