Randy Schekman is a Professor at the University of California, Berkeley. He is one of the world's leading experts on sorting and secretion. The recent postings on The Signal Hypothesis and Signal Recognition particle focus on part of the sorting and secretion pathway. Schekman delivers three lectures on another part of this process, namely the formation of secretion vesicle in the cell and how they travel to the cell surface where they deliver their contents. The lectures are part of the iBioSeminars sponsored by The American Society for Cell Biology [Protein Secretion and Vesicle Traffic].
I think these lectures are examples of high quality science education unencumbered by any overt attempt to persuade the audience to adopt a particular social or political point of view.
[Hat Tip: Bertalan Meskó at ScienceRoll (iBioSeminars: Bringing the best in biological research to the world]