In the Dec. 23 & Jan. 6 SN: Our top stories of 2017, grounded pterosaur hatchlings, protectors of the Dead Sea Scrolls, a counterintuitive metamaterial, neutron star sizing, arrow of time reversed, E. coli in flour and more.
HUMAN DEBUT In the last year, research teams have announced CRISPR gene editing in viable human embryos (single-cell embryo shown).
Claude Cortier/Science Source
STANDING OUT Scientists used to think that ribosomes, molecular machines that build proteins, are identical and interchangeable. But the micromachines are more diverse than previously thought, new research suggests.