Get inspired by a weekly roundup on living well, made simple. Sign up for CNN’s Life, But Better newsletter for information and tools designed to improve your well-being . CNN  —  Researchers have uncovered links between the precursor to the world’s oldest writing system and the mysterious, intricate designs left behind by engraved cylindrical seals that were rolled across clay tablets about 6,000 years ago. Scholars consider cuneiform the first writing system, and humans used its wedge-shaped