To discover more fascinating science content, head to bbc.co.uk, search for BBC Inside Science and follow the links to The Open University.
文 | 财经无忌，作者 | kiki
，更多细节参见heLLoword翻译官方下载
这令人兴奋，也可能令人恐惧。如何知道该走哪条路？如何确认自己做出正确选择？
"These deals mostly increase Reddit's visibility and strategic importance, rather than being the original reason people use it," says Oc.