Scientists have been able to store 2.2 petabytes in one gram of
DNA  Since time immemorial, mankind has wanted to share and use
information for later use. First, it was through the caveman
paintings and symbols. Then we invented the alphabets,
ideograms, numbers and other symbols. Using these, books were
written and stored for future generations, in palm leaves,
papyrus sheets or paper. The invention of printing brought the
Gutenberg revolution, making multiple copies easily and
spreading education to millions of people.  Printed books occupy
space. Libraries and archives are bursting at the seams. Enter
the computer age and digitization using the binary code of
combining zeros and ones (0,1) for alphabets and other such
symbols, and reading them using the on-off electrical signals,
which has made electronic storage possible, cutting down the
size and space for ‘hard copies’. Integrated circuits,
processors and related electronic wizardry have shrunk the size
of computers and storage devices from room-size to