People often compare computers with our brains, but there are important differences between them. One difference, which the wider public seldom thinks about, is that computer brains are made of silicon while our brains are made of carbon. All known life is made of carbon, which is the most versatile element in the universe. Why should computers be made of silicon, even if it is the second most versatile element in the universe? IBM now thinks that the silicon age of computers is about to end, and that we might see the first carbon computer in just six years. It is a bold statement, tempered with caveats, made more with hope than authority. Carbon nanotube chips would be not very different from silicon chips, only much faster. However, making them in large scale still requires significant technology advances. The year 2020 is around the time when silicon is supposed to hit a roadblock, yet again. It will be great to get nanotube chips ready by then. This is what IBM hop...
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