<p>➀ A revolutionary and unconventional wireless forehead e-tattoo has been developed to estimate mental workloads in real-time, offering significant advancements for human-in-the-loop systems in high-stakes environments.</p><p>➁ The device, detailed in a recent article, addresses limitations of traditional monitoring methods such as EEG and EOG, providing a more comfortable and stable solution.</p><p>➂ The research team demonstrated the e-tattoo's capabilities in an N-back test, showing a strong correlation between the e-tattoo's physiological signals and mental workload levels.</p>