LINK of this post: http://www.physics.ucsb.edu/~jpierre/strings/basics.htm
SUPERSTRINGS! String Basics
We are used to thinking of fundamental particles (like
electrons) as point-like 0-dimensional objects. A
generalization of this is fundamental strings which are
1-dimensional objects. They have no thickness but do have a
length, typically 10^(-33) cm [that's a decimal point
followed by 32 zeros and a 1]. This is very small compared
to the length scales that we can reasonably measure, so
these
