This site is one of many on \\\”nanoHUB.org\\\” which highlights availability of on-line simulations. This particular one provides a video of a research seminar on the topic of micromechanical biosensors focusing on aptamer-based receptor molecules. The quality of the graphics in the video is not high – mainly, the smallness of the visuals makes it difficult to decipher the contents. However, the information content, as delivered and described verbally, is coherent and useful. The initial download time is fairly long (can be several minutes). Example topics covered are – design and fabrication of sensors, how they work, about DNA and antigen/anti-body.