In the Dec. 9 SN: Lessons from the Pliocene, searching for new ways to fight MS, a supernova on repeat, the great gene drive debate, spider sleep secrets, an ailing boy gets new skin, kleptopredation and more.
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
CLEARING THE AIR Adult women are about twice as likely to have asthma as men. New work in mice finds that testosterone impacts immune cells involved in the disease.
BRAIN CANDY A new database offers a deep look at living human nerve cells, revealing elaborate branching structures and myriad shapes, such as in this neuron called a pyramidal cell (cell image, left and 3-D computer reconstruction, right).