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  1. Math puzzle: Fresh gridflowers

    Solve the math puzzle from our April 2026 issue, where we plant floras to celebrate an upcoming nuptial.

    By Ben Orlin
  2. Archaeology

    A new study questions when people first reached South America

    Data suggest people lived at Chile’s Monte Verde site thousands of years later than thought, challenging key “pre-Clovis” evidence. Not all agree.

    By Tom Metcalfe
  3. Earth

    Earth’s continental plates were moving 3.48 billion years ago

    Magnetic crystals provide the earliest evidence yet of the plate tectonics that likely made Earth habitable, pushing its start back by 140 million years.

    By Douglas Fox
  4. Microbes

    How warming is shifting microbial worlds

    Climate change is affecting microbes, and that has implications for all life on Earth.