Supercritical CO2 has been looked at a lot for the Brayton cycle which can get 50% efficiency compared to steam that generally caps out around 34%
The US and china both published studies talking about a brayton turbine but to my knowledge no commercial plants running off of it have been built yet
Sports players have a chance to give a message to a very large group of people. More people will see this then if an Iranian member of parliament makes a protest and Iran has condemned the attack numerous times
You are a billionaire you can custom design a new car with no spyware using reliable parts from other large brands
They would melt, but we do also have gamma voltaics which can use the gamma radiation from fission and fusion to generate electricity they just have an atrocious efficiency