91.  It is usually impossible for a human being to deal with so much data by his own.

92.  The data in 2000 are about 7% higher than that in 1900, while the expenses of housing take up 25% in 2000, which become the highest of all.

93.  Their major task is to collect data from senders, then send it to its destination, which looks like exchanging information between them.

94.  They prefer to deal with data.

95.  Then, the backbone providers which spanning the local region will exchange their customers's data, so as to get the fee.

96.  Honestly, the data is not enough.

97.  Here, In a word, housing plays a more and more important role in American people's daily life, and, based on the above data, we have no trouble fingding out that, with time going on, their lifestyles are looking up, too.

98.  In the 10 years, one important data, food, along with transport, entertainment, almost stay still.

99.  Backbone providers connect to each other to exchange data.

100.  Moreover, you shall need chemistry and physics for understanding and explaining the phenomena, mathematics and programming for analyzing the data correctly, literature for showing your discoveries clearly and publish an essay, etc.