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Publisher's Summary

In this issue:
"Mystery of the Hidden Cosmos": The invisible dark matter particles that dominate the universe may come in strange and varied forms.
"What Doesn't Kill You…": Chemicals that plants make to ward off pests stimulate nerve cells in ways that may protect the brain against diseases such as Alzheimer's and Parkinson's.
"Life at Hell's Gate": An astonishing discovery is forcing scientists to reconsider whether life can exist in the most extreme places on Earth and in space.
"Out-Shining Silicon": An upstart material – perovskite – could finally make solar cells that are cheaper and more efficient than the prevailing silicon technology.
©2015 Scientific American
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