The Physics Outreach team at Imperial College London have compiled a comprehensive list of academic speakers who are willing to visit schools to present about various topics. The list can be found on their website (http://www3.imperial.ac.uk/physics/about/outreach/schooltalks ) and details the title of the presentation, the speaker and the intended audience for the talk.
Due to the high level of demand for such speakers, it is sometimes only possible to provide one speaker to a school during each academic cycle. However, our speakers are normally happy to speak to a large group of students.
All talks are bookable online: http://www3.imperial.ac.uk/physics/about/outreach/requestform
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