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.
ANOTHER WRINKLE The outer layer of the human brain has distinctive folds. Work with brains growing in lab dishes is showing how the structures may form.
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.
BREAKING AWAY Breast cancer cells (shown growing in a lab dish) move through the body in clusters. New research may shed light on how the clusters enter the bloodstream.
Tom Misteli, Karen Meaburn/NCI Center for Cancer Research