Male-female duos have only ever won Eurovision twice. The first time this occurred was in 1963 with Denmark's Grethe and Jørgen Ingman who won with the song 'Dansevise.'
Next, in 2011, Azerbaijan's duo Ell/Nikki won the contest with their song 'Running Scared.'
[Sources]
Düsseldorf 2011, Eurovision.tv.
Participants of Düsseldorf 2011: Ell/Nikki, Eurovision.tv.
London 1963, Eurovision.tv.
Participants of London 1963: Grethe and Jørgen Ingman, Eurovision.tv.
Over the years, many different people have hosted the Eurovision Song Contest, but only three people have done it more than once.
Jacqueline Joubert hosted twice (1959, 1961), Katie Boyle hosted a record of four times (1960, 1963, 1968, and 1974), and Petra Mede hosted twice (2013 and 2016).
During the 2016 contest, Petra quipped: "Look out Katie, I am coming for you."
[Sources]:
Eurovision Song Contest 2016 - Semi- Final 2, 1:55:12-1:55:32
List of Eurovision Song Contest Presenters, Wikipedia.com.
For the first 10 years of the Eurovision Song Contest, France placed in the top five. However, no one knows the real rankings of the first Eurovision, so every nation aside from the winner was given second place.
The subsequent rankings are as followed:
Paule Desjardins took home second place in 1957 for the song 'La Belle Amour.'
'Dors Mon Amour' by André Claveau won the 1958 contest.
Jean Philippe's 'Oui, Oui, Oui, Oui' won third place in 1959.
1960 saw another victory for France thanks to Jacqueline Boyer's 'Tom Pillibi.'
'Printemps (avril Carillonne)' by Jean-Paul Mauric took fourth place in 1961.
In 1962, France won the contest once more with 'Un Premier Amour' by Isabelle Aubret.
'Elle était Si Jolie' by Alain Barrière gave the nation its worst score yet in 1963 when it earned fifth place.
Rachel's 'Le Chant De Mallory' won fourth place in 1964.
Finally, in 1965, 'N'avoue Jamais' by Guy Mardel placed 3rd.
In 1963, the Norwegian jury was not finished tallying their votes when presenter Katie Boyle asked them for their votes. In a panic, the Norwegian representative quickly rattled off the preliminary results. However, this led to the announcer dealing out the wrong point totals to the wrong nations. Boyle then announced that she would call Norway back after getting all the votes from the rest of the participating nations.
In the end, the Norwegian votes were entirely different from that of the preliminary result. Their votes ended up giving the victory to Denmark, who was in a close race with Switzerland for the gold.