Imagine this scenario: it's almost the end of your PhD and you're broke and jobless. Then, at a conference, you overhear a professor you'd like to work for discussing a talk. You have something to contribute, so do you a) introduce yourself and join the conversation, or b) loiter nearby drinking cups of tea and fail to summon up the courage to speak?Until 2006, most students would be drinking the tea. However, since then, the scientific community has embraced Twitter and this form of social media has broken down barriers. Twitter can make scientific conversations more open, and it's a huge equaliser. On Twitter, you aren't a professor or a student,
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