1) The document discusses two scientific challenges - mapping the brain's connectivity (connectome project) and understanding how the universe began (MWA project). 2) It describes the techniques of electron microscopy, confocal microscopy, and multi-scale imaging used in the connectome project to deal with the huge data challenge of mapping the brain at the neuronal level. 3) For the MWA project, which studies the early universe using radio astronomy, it addresses the data processing challenges using GPUs and CUDA programming to achieve real-time calibration and imaging of data from the Murchison radio telescope in Australia.