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The Roman emperor Julian (332–363 CE) called bread the food that "among us is thought to be the most nourishing.
The habitable zone concept is useful for understanding which worlds might, possibly, maybe, be habitable. It highlights exoplanets at the right distances from their stars for liquid water to potentially exist on their surfaces. But that alone can't determine habitability.
What is the past? It may seem a simple question to answer, but it is more complex than we might think at first. As science, politics, technologies and ways of thinking change, so does our understanding of what went before.
Scientists have shown that genomics can help identify which wild populations are most vulnerable to climate change—offering practical guidance for conserving threatened species before declines become irreversible.