If flame retardants are in children’s toys, or items like the plastic beaded necklace, they could get into kids’ saliva. Other studies have also found that flame retardants can transfer from ...
Superconductivity is the phenomenon by which, at sufficiently low temperatures, electric current can flow in a metal with no resistance. While certain metals are excellent superconductors, other ...
Even if cracked opals don’t break right away, they have little durability in jewelry, and the fractures spoil the beauty and clarity of the gem. For quality control, producers and dealers single out ...
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