Have any bands dumped their lead singer and formed a successful group? trends now

QUESTION Have any bands dumped their lead singer and formed a successful group?

A good example is Iron Maiden. For their eponymous 1980 debut and their 1981 album Killers, they were fronted by Paul Di'Anno, who delivered the music with a growling, rough-edged menace. 

Unfortunately, Di'Anno got caught up in the rockstar lifestyle and was booted out of the band. They replaced him with Samson's operatic frontman Bruce Dickinson, who is blessed with a pitch-perfect four-octave vocal range. 

He took Iron Maiden to a whole new level in 1982 with the release of The Number Of The Beast, one of the greatest heavy metal albums of all time.

Pink Floyd started out as a psychedelic outfit fronted by flower child Syd Barrett. Although their debut The Piper At The Gates Of Dawn is regarded as a classic, its music is deeply rooted in the 1960s. 

Sadly, Barrett's mental health was in serious decline. He was becoming increasingly paranoid and withdrawn, exacerbated by the use of psychedelic drugs, and was sacked by the band in 1968. 

Vocal duties were taken on by Roger Waters and David Gilmour, who made some of the seminal albums of the 1970s: The Dark Side Of The Moon, Wish You Were Here, Animals, and The Wall.

Paul Wise, Sheffield.

QUESTION Why is freezing point set at 32 degrees and not at 0 degrees on the Fahrenheit scale?

Daniel Gabriel Fahrenheit (1686-1736) wanted a temperature scale that would enable him to easily record daily temperatures without resorting to negative numbers.

According to one story, Fahrenheit set as 0 degrees the lowest temperature he recorded in his native Danzig (now Gdansk in Poland) in the winter of 1708-09. He found he could reproduce this temperature in the laboratory using a freezing mixture of water, ice and ammonium chloride, which was very useful for calibrating his thermometers.