Centers for Disease Control and Prevention
Youth and Tobacco Use
There are a number of social, emotional, and physiological reasons why teenagers start smoking, and why they continue smoking into adulthood. Help class members understand why smoking begins in youth—and how to protect themselves from...
Sophia Learning
Sophia: Order of Magnitude
A short introduction to the concept of order-of-magnitude, with an explanation of how it is used to make estimations in physics.
Curated OER
Science Kids: Science Images: Climbing K2
Five climbers can be seen in this photo as they make their way up K2, the second tallest mountain in the world and one the most difficult to climb. The peak of K2 is 8611 metres (28251 feet) above sea level. For more information on the...
Curated OER
Science Kids: Science Images: Photo of Burj Khalifa
Burj Khalifa is the tallest building in the world, standing at an incredible 828 metres tall (2717 feet) it towers above Dubai, UAE. It includes 160 floors and was officially opened in 2010. This photo of Burj Khalifa is set against a...
Curated OER
Unesco: Denmark: Ilulissat Icefjord
Located on the west coast of Greenland, 250 km north of the Arctic Circle, Greenland’s Ilulissat Icefjord (40,240 ha) is the sea mouth of Sermeq Kujalleq, one of the few glaciers through which the Greenland ice cap reaches the sea....