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Could new US Navy low-frequency sonar endanger whales and other marine life? The possible significance of mice with a larger, more wrinkly brain cortex. New research into a malaria vaccine focuses on white blood cells, not antibodies. International astrobiologists discuss super-volcanoes and other threats to life as we know it. The chemistry that has kept a huge iron pillar in the Quwwat-ul-Islam mosque in Dehli from rusting for 1,600 years.