Short answers, pulled from the story.
Our World was broadcast on Sunday the 25th of June 1967 and reached an estimated audience of 400 to 700 million people, the largest television audience up to that date. The two-hour program was transmitted live to twenty-four countries.
The Beatles performed "All You Need Is Love" for the first time during Our World on the 25th of June 1967, from EMI Recording Studio 1 at Abbey Road in London. The segment was introduced by Steve Race, and friends including Eric Clapton, members of the Rolling Stones, Marianne Faithfull, Keith Moon and Graham Nash joined in on the chorus.
Four geosynchronous communications satellites were used: Intelsat I (Early Bird) and Intelsat II F-3 (Canary Bird) over the Atlantic Ocean, and Intelsat II F-2 (Lani Bird) and NASA's ATS-1 over the Pacific Ocean. Nine ground stations sent and received signals from these satellites.
BBC producer Aubrey Singer conceived the project. Due to its scale, coordination was transferred to the European Broadcasting Union, with Singer remaining as the production's head. It took ten months of planning and involved ten thousand technicians, producers and performers.
The broadcasters of Czechoslovakia, East Germany, Hungary, Poland and the Soviet Union withdrew four days before the broadcast in protest over Western nations' response to the Six-Day War. Their withdrawal caused the removal of an entire scheduled section called The Hungry World.
Our World featured film director Franco Zeffirelli rehearsing Romeo and Juliet in Tuscania, Italy; conductor Leonard Bernstein and pianist Van Cliburn at the Lincoln Center in New York City; sculptor Alexander Calder and painter Joan Miro at Fondation Maeght in France; and opera singers Heather Harper and Grace Hoffman at the Bayreuth Festival in West Germany.