Whether you're reading a review article or a primary research paper, you're likely to come across vocabulary and concepts with which you're unfamiliar. It's a good idea to have other resources on hand to look up those words and ideas. For example, a scientific dictionary is useful for checking unfamiliar vocabulary, and textbooks are excellent starting places to look up scientific concepts. Internet searches for tutorials or explanations about a specific method or concept can also be useful. And don't forget that people, like mentors and science teachers, can also be great resources when you're stuck.