Collaborating, formally or otherwise, is a huge component of your future (and current) success – even if you’re in the early stages of your career as a graduate student or postdoc.
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Why? It’s how science works today – even in academia. You can’t do it all on your own — you need to work with others who have expertise in different areas to identify the right research questions, to ensure that your experiments answer the questions properly and that your data are robust, to fully interpret results and understand their broader implications and ramifications (as well as potential commercial application in some cases).