How can you use sound to locate submarines from the air? That’s the question tackled in our cover story by Jason Furlong from the Royal Canadian Air Force and John Ryder – an RAF pilot who studied physics. Elsewhere in the issue, find out how the first trillionaire could be made in space, possibly by mining an asteroid, and discover why some cosmologists still aren’t sure if dark energy is the right explanation for the accelerating universe. Plus we look at the importance for inventors of acquiring intellectual-property rights and find out why applying for grant money is still so hard.
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