Misc: In 1881 Sir Alexander---------- , cashed in on penicillin (Nobel 1954), born. ?

Questions

Duets - Dionne Warwick had a No.1 hit song, 'Then Came You,' with what artists?

Duets - Paul McCartney teamed up with _________________ and had a No.1 with 'Ebony and Ivory' in 1982?

Duets - Who was Phil Collins' partner on 'Separate Lives'?

Duets - Brandy and ______________ had a No.1 with 'The Boy Is Mine' in 1998?

Duets - Who was Puff Daddy's duet partner on 'I'll Be Missing You' in 1997?