Briefly describe the “ah-ha” moment for each of the following researchers, as we

Briefly describe the “ah-ha” moment for each of the following researchers, as we

Briefly describe the “ah-ha” moment for each of the following researchers, as well as the specific question of human infant language development they sought to answer. How did each go about it, and what did they discover?
Kathy Hirsh-Pasek
Jenny Safran
Erich Jarvis