SMRTR Science & EngineeringJun 15, 2026Interesting Engineering

7 oldest things found on Earth that reveal our planet’s deep past

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Earth's oldest discoveries reveal billions of years of planetary history. Jack Hills zircon crystals from Australia, dated at 4.375 billion years old, suggest early Earth may have had surface water sooner than thought. Other finds include 3.6-billion-year-old mountains, ancient stromatolite fossils, and 3.3-million-year-old stone tools predating humans, collectively reshaping our understanding of life's origins and human evolution.

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