What makes the beautiful “ice-flowers” on a frosted window-pane? (Vol. 14, p. 226).
How do trappers prepare valuable fur-skins so as to preserve them until they get to market?
The skins are simply dried in the air, as stated in the article Fur, which was written by the head of a great wholesale fur business.
How does the amount of air in a room spoiled by an ordinary gas-burner, or a small reading-lamp, compare with the amount spoiled by a man’s breathing?
The gas burner or the lamp spoils four times as much air, as shown in the article Ventilation.
What part of your weight is blood?
One-twentieth. (Vol. 27, p. 939).
What domestic animal is oftenest born with only one eye?
The pig. (Vol. 18, p. 743).
Which covers the more space, the United States (without Alaska) or Europe?