The pleasant smell of first rain after a long time (called petrichor) is actually due to geosmin produced by bacteria present in wet soil. It is also attributed to an oil released by plants to keep themselves from drying out.
3D printers today can print clothing, houses, lenses, food, body parts and 3D printers also.
3d printing can be used to print sonograms i.e. life size developing babies. These 3D sonograms are used to help blind expectant parents "see" their babies.
A drop of liquid can be held up by its vapour if its in touch with a hot surface.
At many places. Up until the mid-15th century, all children were referred to as girls. Boys were called "knave girls" and girls were called "gay girls". Previously the word boy, meant a servant.
The brain does not feel pain because there are no pain receptors in the brain.