There are few more sobering online activities than entering data into college-tuition calculators and gasping as the Web spits back a six-figure sum.

在大学学费计算器里输入数据，然后对着网络吐出来的六位数倒抽一口气——很少有其他在线活动比这种活动更能让人清醒了。

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"We hope that someone will ask a question that can't readily be answered," says Hopkins High School student Barry Anderson, "and through the online activities, an answer will be found—a discovery!"

“我们希望有人会提出一个无法轻易回答的问题，”霍普金斯高中的学生巴里·安德森说，“通过在线活动，找到答案，就像一个发现那样！”

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Organizations are leading some online activities.

一些组织正在开展一些线上活动。

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Translating those principles to online activities isn't easy, and the NLRB hasn't provided specific guidance.

WSJ: When a Facebook Rant Gets You Fired

Like many parents, I am struggling with the boundaries of monitoring my kids' online activities.

CNN: The secret life of my sixth grader

It also included tools such as Tor that can mask a person's online activities.

BBC: Anonymous operating system prompts security warnings