Maya Erikson 3. Maya Erikson y la cueva de hielo

¿Y si el universo no pesara nada y la materia no existiera realmente? Lo que parecería ser una duda legítima para un erudito místico de los Vedas Indios es, en cambio, un resultado embarazoso de la aplicación de la Relatividad Restringida a las observaciones obtenidas por un grupo de astrofísicos, que han medido la radiación cósmica de fondo de nuestro universo. En los albores del nuevo milenio, el satélite WMAP, más allá de proporcionarnos una medida del cosmos, nunca antes obtenida, ha creado bastantes quebraderos de cabeza respecto al concepto de universo, en el que todavía hoy ...

As a successful former slave, Clara Brown used her money to help other freed slaves get a new start in life. In 1859 Clara bought her own freedom and headed west to Colorado to find her daughter, who was sold when she was just a little girl. Clara didn't find her daughter there, but she did get rich. The people she helped became her family, and she became known as "Aunt" Clara Brown.

As the COVID-19 pandemic has spread around the world, it's left many adults and children searching for answers about how they can stay safe. By focusing on facts presented in a relatable way rather than fear, this illustrated guide to health and safety gives children the tools they need to understand what's happening in the world and to discover how they can become a virus warrior. Facts about coronaviruses are paired with essential information about social distancing, personal hygiene, and the things we can control in uncertain times, creating a learning experience designed to reduce...

This collection of four titles approaches the four essential ethical topics of the virtues of listening, prudence, patience, and effort. Each of these virtues is highlighted through illustrated mini stories so children can understand the importance of nurturing and strengthening them in themselves and in others.