Uncategorized

  1. Paleontology

    ‘Echidnapus’ hints at a lost age of egg-laying mammals

    The fossil discoveries double the number of known monotreme species during the Cretaceous Period.

    By Carolyn Gramling
  2. 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
  3. 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
  4. 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.