Stuart A Kallen

On a global scale, humans create around 2.6 trillion pounds of waste every year. None of this trash is harmlesslandfills and dumps leak toxic chemicals into soil and groundwater, while incinerators release toxic gases and particles into the air. What can we do to keep garbage from swallowing up Earth? Reducing, reusing, recycling, and upcycling are some of the answers. Learn more about the work of the US Environmental Protection Agency, the Ocean...

As the planet's human population explodes, so does the demand for water. About one out of every nine people in the world does not have access to safe drinking water, while one out of every five-almost 1.5 billion humans-lives in a region where water demand is outstripping supply. But as demand grows, supplies do not. Climate change has led to severe drought, flooding, and massive storms in key agricultural areas of the world. Industrial and agricultural...

Long before Europeans explored the lands and waters above the Arctic Circle, several Inuit groups lived in this harsh, snowy landscape. While many aspects of Arctic life have changed, the Inuit are working to preserve their traditional practices and languages.

En el Pacífico Sur, en 1944 y 1945, se libraron batallas militares entre Estados Unidos y Japón. Rodeados del traqueteo de las balas y las explosiones de las bombas, un grupo de marines navajos enviaba mensajes secretos de un lado a otro. Usaron un código que crearon a partir del idioma navajo, y que el enemigo nunca pudo descifrar. Estos jóvenes fueron reclutados de sus hogares en el suroeste de Estados Unidos. Trajeron consigo una resistencia...

1952 On June 26, 1952, twenty-five men and five women entered the waiting room of a railway station in Port Elizabeth, South Africa. If they had been white people of European descent, they would have gone unnoticed. But they were black South Africans who were violating the waiting room's "Europeans Only" sign as part of the Campaign of Defiance against Unjust Laws. Instituted by the African National Congress (ANC), the campaign aimed to peacefully...

During World War II, Allied spies and secret agents worked behind the scenes to send messages and discover the enemy's plans. Learn more about these hidden heroes: a famous singer, a baseball player, a writer, and many others.

Take an expedition with Coronado and primary sources to learn more about his travels.

Briefly describes the physical characteristics, habitat, and behavior of polar bears.

Presents information about the breed of cat which was discovered in California in 1981 and whose ear tips are curved back and towards the center of the head.