People who grew up in cities tend to be worse navigators - "People who spent their childhood in rural or suburban areas tended to be better at navigating in the game Sea Hero Quest than those who grew up in cities. This difference could be seen decades later, the researchers report in Nature..."
The axis of rotation of a black hole in a binary system is tilted more than 40 degrees relative to the axis of the stellar orbit. Scientists have often assumed this difference to be very small and the finding challenges current theoretical models of black hole formation.