Hewlett-Packard (HP) Fourier Analyzer 5451A, one of the first calculator - computer in the world. A funny photographic poster done by Berkeley University students in 1972. The text "A Frenchman invented it" is written at the base of the miniskirt. It is a joke between the Mathematician Jean-Baptiste Joseph Fourier and the inventor of the miniskirt, both French!
New spray-on solar technology can turn all windows and other exposed surfaces into solar panels. A film of light absorbing meta-nano-particles is sprayed on surfaces like windows to make them capable of trapping the sunlight and converting it to electricity. Perhaps one of the most advanced solar inventions, spray-on films can generate electricity on see-through glass and even exterior walls. However, this technology is still mostly restricted to the lab.