Pretty cool... Fossil fuel-free jet propulsion with air plasmas
Humans depend on fossil fuels as their primary energy source, especially in transportation. However, fossil fuels are both unsustainable and unsafe, serving as the largest source of greenhouse gas emissions. Researchers in China have demonstrated a prototype device that uses microwave air plasmas for jet propulsion, generating the high-temperature, high-pressure plasma in situ using only injected air and electricity. They describe the engine in AIP Advances.