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Space exploration has also led to many indirect benefits. The challenge and difficulty of the space programme, and its ability to draw on some of the finest minds, has brought about great leaps in technology. The need to reduce weight on rockets led to miniaturisation, and so to the micro-chip and the modern computer. The need to produce safe but efficient power-sources for the Apollo missions led to the development of practical fuel-cells, which are now being explored as a possible future power-source for cleaner cars. The effects of zero-gravity on astronauts has substantially added to our knowledge of the workings of the human body, and the ageing process. We can never know exactly which benefits will emerge from the space programme in future, but we do know that we will constantly meet new obstacles in pursuit of our goals, and in overcoming them will find new solutions to old problems.