科学60秒:强大程序帮你瞒天过海
Imagine that you want to send a secret message to your colleague at the CIA. You can ___1___ it to prevent counterspies from reading it. But they'll still know you were sending some sort of messa...
为你的生活设定目标
美文Why is setting goals important? Because goals can help you do, be, and experience everything you want in life. Instead of just letting life happen to you, goals allow you to make your life ha...