Five new counting books all share one essential strategy: to start a conversation. By Amy Alznauer A counting book is tricky to write, for it must inspire readers to do two things at once: to count ...

Is it possible to count objects you can't see? If you've ever received a boxed gift, or a mysterious package from Amazon, you might have tried to lightly shake the box to try to guess its contents.

Helena Osana received funding from the Social Sciences and Humanities Research Council of Canada for this research. Jairo A. Navarrete-Ulloa receives funding from the National Agency for Research and ...