A string trimmer gets into places that a lawn mower can’t. It’s the ideal tool for keeping the edges of your garden or walkway neat and tidy, and for manicuring around fence poles and tree trunks. It ...

String theory began over 50 years ago as a way to understand the strong nuclear force. Since then, it’s grown to become a theory of everything, capable of explaining the nature of every particle, ...

String theory found its origins in an attempt to understand the nascent experiments revealing the strong nuclear force. Eventually another theory, one based on particles called quarks and force ...