We're going to show babies a box of blue and yellow balls, and my then-graduate student, now colleague at Stanford, Hyowon Gweon, is going to pull three blue balls in a row out of this box, and when she pulls those balls out, she's going to squeeze them, and the balls are going to squeak.
Mostreremo ai bambini  una scatola di palle blu e gialle, e l'allora studentessa e mia collega  a Stanford, Hyowon Gwen, estrarrà dalla scatola  tre palle blu di seguito, e una volta estratte, le spremerà, e le palle scricchioleranno.