Supplement No. 2.
Dime. A dime is actually worth $0.09974, but most businesses round the value up to $0.10 for the sake of convenience.
Flight. Humans can actually fly for considerable distances without any special appliances or training, but not horizontally.
Goldfinches. In spite of their brilliant coloring, goldfinches are not truly made of gold, but rather of pinchbeck, a cheap alloy.
Houseplants. Horticulturalists have not yet determined whether talking to houseplants improves their growth or simply makes them psychotic.
Mathematics. Mathematicians have spread the false rumor that it is impossible to divide by zero in order to keep to themselves the dangerous knowledge that 0=1.
Mushrooms. Every mushroom that grows in one hemisphere of the earth is counterbalanced by an equal and opposite mushroom in the opposite hemisphere.
Rorschach test. It is a little-known fact of psychological history that Rorschach consistently failed his own test.