La historia de los sistemas numéricos: Valor posicional (The History of Number Systems: Place Value)

"While preparing for Christmas in Puerto Rico, seven-year-old Esmeralda asks the Three Magi for a baby doll like her cousin's, but when they bring something else instead she gains a deeper understanding of the meaning of the holiday."

Antes de que Kamala Harris se convirtiera en abogada, senadora y vicepresidenta de Estados Unidos, fue una niña a la que le encantaban los superhéroes. Y cuando los buscaba a su alrededor, ¡se sorprendía al encontrarlos en todas partes! Los había en su familia, entre sus amigos, incluso en su misma calle; los superhéroes estaban dondequiera que ella miraba. Y esos superhéroes le enseñaron que todo lo que se necesita para ser un superhéroe es dar lo mejor de ti. En esta motivadora y expresiva memoria, que va directa al corazón de los niños, Kamala Harris lleva a los lectores a...

What keeps objects from floating out of your hand? What if your feet drifted away from the ground? What stops everything from floating into space? Gravity. As in his previous books, Redwoods, Coral Reefs, and Island, Jason Chin has taken a complex subject and made it brilliantly accessible to young readers in this unusual, innovative, and very beautiful book.

This guide gathers a selection of more than 500 species of vertebrate animals cataloged and arranged in colored illustration. It is an exhaustive and complete guide that provides precise information about each species, and that captures all the beauty and diversity of the vertebrate world in spectacular design and with enthralling visuals.