May 2016: Harvard's IT Academy, at SGM-106, Thursday, May 19, 2016

    Our next talk will be on May 19th 2016 when members of Harvard’s IT Academy Team will talk about their initiative in providing training and skills to IT professionals who work at Harvard.

    July 2016: Attacks Against Higher Education, at SGM-106, Friday, July 22, 2016


    Bob Shaker of Symantec will talk about his experiences  dealing with attacks on Educational establishment's IT infrastructure in a talk titled:

    Professionalization of the Cracker and Stories from the Field; Attacks Against Higher Education.



    Incompressibility of Water

    What it shows

    The bulk modulus of water is about 2.2 x 109 Pa, which means that a change of 1 N/m2 of external pressure on the liquid is able to change a given volume of it by a factor of 4.5 x 10-10 (for comparison, the same pressure change would produce a volume change of about 7 x 10-6 for air and 7 x 10-12 for cast steel ). So if we can completely fill a Florence flask with water, we can use it as a hammer to drive a nail into a board!

    Read more about Incompressibility of Water

    Microscope Resolution Tuesday, December 6, 2016

    What it shows:  The wave nature of light limits our ability to see the very small. Application of the Rayleigh limit of resolution tells us that the size of the smallest objects one can resolve under a microscope is approximately equal to the wavelength of light. The optical limits of a microscope are demonstrated as one attempts to resolve 1 μm diameter spheres (about twice the wavelength of light) — one sees spots of light surrounded by diffraction rings rather than sharply defined spheres, similar to the 3rd image (from: Cagnet/Francon/Thrierr, Atlas of Optical… Read more about Microscope Resolution

    Telescope Resolution

    What it shows

    A telescope (with video output) at the front of the lecture hall is focused on two point light sources at the rear of the hall. Although the light sources are only 1/2 mm apart, they are readily resolved. The Rayleigh limit of resolution can be clearly shown by reducing the telescope aperture to the point where the two light sources can barely be resolved, similar to the following images (from: Cagnet/Francon/Thrierr, Atlas of Optical Phenomena). At the Rayleigh limit the centers of both point sources coincide with the the first minimum of the other source.… Read more about Telescope Resolution