Three small systems showing probable room-temperature superconductivity

► In CdF2-based systems superconducting Tcs above 300 K are found by four methods. ► Four methods show superconductivity above 700 K in some carbon-nanotube-based systems. ► Channels through films of OAPP have a much larger σ than Cu at 300 K. ► High σ in channels through films of OAPP persists to current densities >108 A cm−2. ► Conducting channels through films of OAPP have negligible electronic contribution to κ.