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This NASA Scientist Helps Prevent Mars from Contamination
The spacecraft has to be extremely clean. The entire spacecraft—that includes the rover, the heat shield, the descent stage, and back shell—must contain less than 500,000 bacterial endospores, or spores. Just to give you an idea, a teaspoon of seawater has ten times more bacteria.
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The story of the dolphin reveals how intelligence evolved, step by step, over billions of years.
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Witness how Native North Americans have generated scientific knowledge over thousands of years.
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Follow the relentless quest that led to a breakthrough treatment for a deadly disease.
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Archaeologists investigate the dramatic origins of democracy in ancient Greece 2,500 years ago.
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Follow the Artemis mission to bring humanity back to the Moon for the first time since Apollo.
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Surprising evidence at the world’s oldest temple overturns our understanding of human history.
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New evidence sheds light on the remarkable life—and mysterious collapse—of the ancient jungle city.