The universe's earliest stars comprised unique chemical compositions, but they have burnt themselves out by now, he explains, so scientists will have to look for remnants from these stars in today's suns. (sciencemag.org)
Sodium Carbonate (aka Washing Soda or Soda Ash) is a highly alkaline substance that's unique chemical composition makes it excellent for household uses like degreasing, brightening and cleaning tough messes. (wellnessmama.com)
Each type of spider silk has a unique chemical composition, molecular structure and material properties [4]. (journals.plos.org)