The weight of air in a milk glass is about the same as the weight of one aspirin tablet.
In many countries, urine was used as a detergent for washing.
American car horns beep in the tone of F.
Approximately 60% of the water used by households during the summer is used for watering flowers and lawns.
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.