前几天我和物理系的一个同事聊天，聊天到最后，我们探讨了一个发明是如何改变一切的。

I was talking to one of my colleagues in the physics department the other day, and we ended up discussing how one discovery can change everything.

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在那年最后的日子里，法伯给他的病人注射了一种还处于试验阶段的药物氨基喋呤。不到两个星期，男孩又能走路、聊天和吃饭了。

In the last days of the year, Farber injected his patient with an experimental drug, aminopterin, and within two weeks he was walking, talking and eating again.

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最后公司也希望能通过增加新的方式如广告等，从免费的语音和视频聊天中获得更多收入。

Finally, the company also hopes to find ways to better monetize free calling and video chats, adding new models such as advertising to do so.

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