I'm not sure how true the statement - without Babbage there would be no computers - is.... would someone else have invented them?
Think I will go for Lennon...even though he is probably not even the best in his own band!
An interesting question and one raised recently by Malcolm Gladwell:
This phenomenon of simultaneous discovery—what science historians call "multiples"—turns out to be extremely common. One of the first comprehensive lists of multiples was put together by William Ogburn and Dorothy Thomas, in 1922, and they found a hundred and forty-eight major scientific discoveries that fit the multiple pattern. Newton and Leibniz both discovered calculus. Charles Darwin and Alfred Russel Wallace both discovered evolution. Three mathematicians "invented" decimal fractions. Oxygen was discovered by Joseph Priestley, in Wiltshire, in 1774, and by Carl Wilhelm Scheele, in Uppsala, a year earlier. Color photography was invented at the same time by Charles Cros and by Louis Ducos du Hauron, in France. Logarithms were invented by John Napier and Henry Briggs in Britain, and by Joost Bürgi in Switzerland.
"There were four independent discoveries of sunspots, all in 1611; namely, by Galileo in Italy, Scheiner in Germany, Fabricius in Holland and Harriott in England," Ogburn and Thomas note, and they continue:
The law of the conservation of energy, so significant in science and philosophy, was formulated four times independently in 1847, by Joule, Thomson, Colding and Helmholz. They had been anticipated by Robert Mayer in 1842. There seem to have been at least six different inventors of the thermometer and no less than nine claimants of the invention of the telescope. Typewriting machines were invented simultaneously in England and in America by several individuals in these countries. The steamboat is claimed as the "exclusive" discovery of Fulton, Jouffroy, Rumsey, Stevens and Symmington.
For Ogburn and Thomas, the sheer number of multiples could mean only one thing: scientific discoveries must, in some sense, be inevitable. They must be in the air, products of the intellectual climate of a specific time and place. It should not surprise us, then, that calculus was invented by two people at the same moment in history. Pascal and Descartes had already laid the foundations. The Englishman John Wallis had pushed the state of knowledge still further. Newton's teacher was Isaac Barrow, who had studied in Italy, and knew the critical work of Torricelli and Cavalieri. Leibniz knew Pascal's and Descartes's work from his time in Paris. He was close to a German named Henry Oldenburg, who, now living in London, had taken it upon himself to catalogue the latest findings of the English mathematicians. Leibniz and Newton may never have actually sat down together and shared their work in detail. But they occupied a common intellectual milieu. "All the basic work was done—someone just needed to take the next step and put it together," Jason Bardi writes in "The Calculus Wars," a history of the idea's development. "If Newton and Leibniz had not discovered it, someone else would have." Calculus was in the air.
Of course, that is not the way Newton saw it. He had done his calculus work in the mid-sixteen-sixties, but never published it. And after Leibniz came out with his calculus, in the sixteen-eighties, people in Newton's circle accused Leibniz of stealing his work, setting off one of the great scientific scandals of the seventeenth century. That is the inevitable human response. We're reluctant to believe that great discoveries are in the air. We want to believe that great discoveries are in our heads—and to each party in the multiple the presence of the other party is invariably cause for suspicion.
