Ruckus
10/18/2016, 2:12 PMadd(someClass) and and(someClass) will do an intersection, where as just someClass will do nesting (so aClass { and(someClass) { ... } } will be rendered as as .a-class.some-class { ... }, while aClass { someClass { ... } } will be rendered as .a-class .some-class { ... } (notice the space)).