<human>:  When was the disease called ‘Aids’ first discovered?
<bot>: Aids was first discovered in 1981 by a team of researchers led by Robert Gallo. The researchers were studying a rare form of cancer called Kaposi’s Sarcoma, which is a cancer that affects the blood vessels and lymphatic system. The researchers were trying to figure out why these cancers were so rare and what they were made of. They were trying to find the cause of Kaposi’s sarcoma, but instead they discovered a new disease called Acquired Immune Deficiency Syndrome (AIDS).