Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Although polystyrene consumer products are incredibly common, the economics of recycling means most of this type of plastic ...

Researchers are testing a new method of capturing CO2 from energy-intensive industries and converting it into valuable ...

The khipu knot-tying system was thought to have only been used by elites, but one artifact suggests commoners, too, knew how ...