You may wonder what another civilization might regard as relatively reliable biosignatures of Earth, were this civilization to observe Earth from a distance of tens of light-years.
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A new national study on "biosignatures" for depression treatment is groundbreaking in its approach and sophistication; it could usher in a new frontier of brain science.
Gliese 581 may be small as stars go, but it looms huge in the vision field of planetfinders.
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