Your cat is leaving a chemical on your face. Its name is F4. The translation is “you’re family,” and cats only leave it on people and animals they trust. F4 was identified in 1998 by a French researcher named Patrick Pageat.
— Anish Moonka (@anishmoonka) April 29, 2026
Pageat found five different chemicals coming out of… https://t.co/E99rR1y0c6