Caption

A woman with graying hair, wearing a brown sweater, sits at a desk in front of a chalkboard covered in chemical equations, gesturing with her right hand while holding a white marker in her left, speaking as if teaching. She remains seated throughout, her mouth moving and her right hand making various open-palm and pointing gestures to emphasize her words, while the left hand holding the marker stays relatively still. The setting is a classroom, with a computer monitor displaying the Windows logo to her left and a bottle on the desk to her right.