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Ethicist Teen Voices Upfront Topics Magazine Info DNA: Too Much
Information?  As scientists unravel the mysteries of DNA,
concerns arise about its potential misuse  By Amy Harmon  When
scientists first decoded the human genome in 2000, they
portrayed it as proof of humankind's remarkable similarity. The
DNA of any two people, they said, is at least 99 percent
identical.  Now, however, researchers are exploring the
remaining 1 percent to explain differences among people of
different continental origins—and that's proving to be a lot
trickier.  For example, scientists have recently identified
small differences in DNA that account for the pale skin of
Europeans, the tendency of Asians to sweat less, and West
Africans' resistance to certain diseases.  At the same time,
genetic information is slipping out of the lab and into everyday
life: Ancestry tests tell people what percentage of their genes
are from Asia, Europe, Africa, and the Americas. The heart-di