Numbers
 By default, computed with doubleprecision floatingpoint
values
29/4 == 7.25 ,
not 7
 You can force integer math with the use integer; pragma
 Can be expressed in decimal, hexadecimal or octal
255 == 0377 == 0xFF
 Numbers starting with a zero are always seen as octal.
Strings
 Can contain any data, even the null character (0x00)
 Can be arbitrarily large
 Perl keeps track of size internally


