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A person may become immune to a specific disease in several ways. For some illnesses, such as measles and chickenpox, having the disease usually leads to lifelong immunity to it. Vaccination is another way to become immune to a disease.

myBrainshark is a superb tool that allows students to add a voiceover to PowerPoint presentations, Word documents, videos and photo albums -- or to simply produce podcasts. It then blends the visual and audio components together into a video presentation. In the classroom, your students can present completed projects using myBrainshark, rather than face-to-face, or they can use it for mock presentations allowing the teacher to give feedback before the real presentation. The former can help bolster the confidence and communication skills of introverted and/or passive learners. Teachers can also turn their PowerPoint presentations into narrated video presentations (e.g. explanation of concepts) that students can watch outside of school hours. The most immediate limitation of this tool is that presentations cannot be downloaded in the free version. If you are looking for a tool that also allows for video narratives along with PowerPoint presentations (instead of basic audio), I would suggest Present.me.

Cell Transport 6 min