First-principles plasma simulations show that black holes can’t keep their magnetic fields.

Like a tourist without a map, tumor-fighting T cells have a hard time finding their destination without directions. According to Clark et al. (page 2221), dismantling these directions helps skin cancer cells hide from killer T cells. To enter the skin, T cells must grab on to the adhesive molecule E-selectin, which is expressed on the endothelial cells lining blood vessels in the skin. The auth...

A b-skeleton is a proximity graphs with node neighbourhood defined by continuous-valued parameter b. Two nodes in a b-skeleton are connected by an edge if their lune-based neighbourhood contains no other nodes. With increase of b some edges a skeleton are disappear. We study how a number of edges in b-skeleton depends on b. We speculate how this dependence can be used to discriminate between ra...

A β-skeleton is a proximity graphs with node neighbourhood defined by continuousvalued parameter β. Two nodes in a β-skeleton are connected by an edge if their lune-based neighbourhood contains no other nodes. With increase of β some edges a skeleton are disappear. We study how a number of edges in β-skeleton depends on β. We speculate how this dependence can be used to discriminate between ran...