I'd like to point out 90 Kelvin isn't the highest temperature superconductor (likely) reported, not even close. There were Mercury-based HgBa2Ca2Cu3O8 "high tem

I'd like to point out 90 Kelvin isn't the highest temperature superconductor (likely) reported, not even close. There were Mercury-based HgBa2Ca2Cu3O8 "high temperature superconductors" (thought to operate similar to the common YBCO ones) that have achieved up to 134 Kelvin years ago. Recently, there was also a conventional superconductor at up to 203 Kelvin (!) at extremely high pressure based on HS3 or somesuch and that seems to have been pretty widely accepted and replicated. https://www.nature.com/articles/nature14964 https://www.nature.com/articles/nature14964 It's thought that modifying the sulfur hydride based superconductors could result in near-room-temperature superconductivity (above 0 Celsius). Occasionally, people claim room temperature superconductivity in carbon allotropes such as graphene, but take those with a grain of salt as they haven't really been replicated. Anyway, yeah, this silver and gold material is almost certainly bogus.