Superconductivity at room temperatures:
Professor Dias and the team made the material by taking a rare earth metal named lutetium and mixed it with hydrogen and a small part of nitrogen. They were then left to react for two or three days, at high temperatures.
The compound came out a as a rich blue, according to the paper. But it was then pressed at very high pressure, when it turned from blue to pink as it reached superconductivity, and then again became a rich red at its non-superconducting metallic state.
To work, the material still requires being heated to 20.5 degrees Celsius and compressed to about 145,000 psi.
Room temperature superconductivity has been a goal for many decades. The high pressure is an issue, but not requiring extreme cold is a huge step forward.
Not mentioned are the current density problems with other superconducting materials. That is also a huge road block for many applications.