Here s a tattoo your mom might actually condone you getting.

The temporary, electronic tattoo, developed by a team of scientists at Tel Aviv University s Center for Nanoscience and Nanotechnology, sticks to skin and uses a carbon electrode and a conductive polymer to measure biometric signals for hours.

When worn on the face, the electrodes are sensitive enough to record variations in muscle activity, which can identify expressions and even emotions, according to a paper published last month in the journal Scientific Report.

We were initially developing carbon nanotube-based electrodes which we originally wanted to use as implantable electrodes, lead researcher Yael Hanein told Digital Trends.

Knowing full well the dire need for dry skin electrodes, we thought about applying our technology for EEG and EMG.

Sticking carbon nanotubes directly against the skin seemed to be problematic, so we looked for alternative fabrication and material …

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