In Nature, Mefford, Chueh, and colleagues describe how they investigated the oxygen evolution reaction (OER) in situ at sub-micrometer resolution. Nanoscale variations of current density, geometry, oxidation states show that currently emerging potentially paradigm-shifting picture redox-active, structurally dynamic catalyst materials might need to include nanoscale. The (O2) (OER), also denoted...

Touch screens are very convenient because one can directly point to where it is interesting. This paper presents an inexpensive technique to transform an ordinary screen into a touch screen using an ordinary camera. The setup is easy: position a camera so it can see the whole screen. The system calibration involves the detection of the screen region in the image. which determines the projective...