Paper is made out of wood pulp which contains cellulose. Another organic substance binding the cells, fibers and vessels that constitute wood, is LIGNIN. Apparently, it is the most abundant renewable carbon source after cellulose. Cellulose, a colourless substance, is remarkably good at reflecting light, which means we see it as being white. To make a fine white paper (Bond… Read more →
This is related to pharmacology and pharmacy. Generally, prescriptions written by doctors have these symbols at the beginning. Rx It actually comes from the word ‘Recipere’, meaning prepare. In medieval times, pharmacists used to make drugs and doctors would just write down the components and amounts to be needed and send the patients to the pharmacists with the prescription. The… Read more →
