Israeli scientists have built a DNA computer so tiny that a trillion of them could fit in a test tube and perform a billion operations per second with 99.8 percent accuracy. Instead of using figures and formulas to solve a problem, the microscopic computer's input, output and software are made up of DNA molecules -- which store and process encoded information in living organisms.
The United States is still on high alert for more anthrax attacks but another more deadly biowarfare agent took center stage Tuesday as scientists warned of the catastrophic effects of smallpox.
The complex structure of the Internet makes it resistant to errors or failure but is also its Achilles heel, scientists in the United States. Because the system is so varied, if one or more nodes --- the crossroads through which Internet data travel -- go down, it has very little impact.
Scientists issued a warning on Wednesday about the potential danger of using an enzyme to immortalize cells for research or grow tissue to treat disease. They found that telomerase, the so-called fountain of youth enzyme that helps cells live longer, is linked to a cancer-causing gene and could increase the risk of disease.