"Internships are optional. It won't make a difference if I don't do one."
WRONG.
It's a very competitive world out there. The better prepared you are, the better your chances for success, whether applying to graduate school, medical school, or for a job. Internships are rapidly becoming a virtual requirement for many science-related careers.
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Find out what it's like to do full-time research in a research-intensive environment (some people love it - some people hate it - everyone finds it's different than they expected)
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Learn more about a specific topic.
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Fit the knowledge you've acquired from your courses into a larger context.
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Acquire new laboratory skills and learn new techniques.
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Refine your scientific writing and presentation skills.
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Meet new people who can help you in your career.
Do an internship. You'll be glad you did.