Taylor Swift’s third studio album “Speak Now” was released. It won Billboard’s 2011 Album of the Year.
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Italian astronomer Giovanni Cassini discovered Iapetus, Saturn's third-largest moon.
London's last horse-drawn omnibus trip went from London Bridge Station to Moorgate.
Scientists in India discovered a 152-million-year-old fossil of an extinct marine reptile called the ichthyosaur.
The British singer Cliff Richard was knighted by Queen Elizabeth II.
Benjamin O. Davis Sr. became the first African American US Army brigadier general.
