Hackers slowed Twitter to a standstill early on Aug. 6, frustrating millions of users.
How Did Hackers Cripple Twitter?
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A New Approach to Designing the AIDS Vaccine
The U.S. Secretary of Health and Human Services boldly announced in 1984 that there would be an AIDS vaccine within two years. The discovery of an AIDS-causing virus , she said, was already demonstrating “the triumph of science over a dreaded disease.” Today, 25 years and many failed attempts later, an AIDS vaccine seems as elusive as ever