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  1. Physics

    The second law of thermodynamics underlies nearly everything. But is it inviolable?

    Two centuries on, scientists are still seeking a proof of the Second Law and why heat always flows from hot to cold.

    By Tom Siegfried
  2. Anthropology

    Child sacrifices at famed Maya site were all boys, many closely related

    DNA analysis shows victims in one underground chamber at Chichén Itzá included twins, perhaps representing mythological figures.

    By Bruce Bower
  3. Health & Medicine

    Long COVID finally gets a universal definition

    If broadly adopted, this inclusive description of long COVID will help legitimize the ongoing struggles millions of people are facing post-infection.

    By Tina Hesman Saey
  4. Space

    Human spaceflight’s new era is fraught with medical and ethical questions

    A new project called the Space Omics and Medical Atlas aims to study and document astronaut health as commercial spaceflight starts to take off.