Had a tough day? Soon you'll be able to prove it as researchers have unveiled a groundbreaking way to track when your brain is working too hard—with a face tattoo.

In a study published today in the Cell Press journal Device , scientists introduced a wireless, temporary electronic forehead tattoo that monitors brainwaves to objectively measure mental workload.

Designed to help change the way we monitor cognitive fatigue in high-stakes professions like air traffic control, truck driving and other focus-intensive roles, the tattoo analyses brain activity in real time, detecting how hard you are working.

"Technology is developing faster than human evolution. Our brain capacity cannot keep up and can easily get overloaded," said Nanshu Lu, senior author of the study and professor at the Un

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