MathematicsA rethink of cause and effect could help when things get complicated Some scientists insist that the cause of all things exists at the most fundamental level, even in systems as complex as brains and people. What if it isn't so? Features
LifeFossil hints that orcas don’t have a long history of killing whales A 1.4-million-year-old fossil relative of killer whales had teeth that suggest it ate small fish rather than large marine mammals News