13 Stripes in the American Flag*
*in meaning within, therefore 13 Stripes within the American Flag.
21 Key of the Door (bingo call)
21 Key of the Door (bingo call and a song about 21st birthday)
57 Heinz Varities
This can be seen on the label of all Heinz products and represents the number of products Heinz has.
These problems are called Ditloids and there are many many more.
Almost holds the record as the longest common English word with what features?
It is the longest word where the letters are in alphabetical order
Most things will usually expand because the atoms in it get heated and force the boundaries outward. Water is the exception which expands when frozen.