Final answer:
The author learns about her ability to read lips and see at the speed of sound at summer camp.
Step-by-step explanation:
In the summer camp, the author learns about her ability to read lips and see at the speed of sound. This ability is highlighted through her observation of the Nightingale and her interaction with a woman at the camp.
The author, through seeing the shadows that come and go across the woman's lips, gleans hints of her thoughts. She also notices the woman's yellow-hazel eyes following her, showing her keen ability to perceive details.
Furthermore, the author's ability to read lips is exemplified in the story of Helen Keller, who learned to spell words through finger play and developed a sense of language. This demonstrates the power of visual communication in understanding and acquiring knowledge.