I like the way this website is organized by course and topic, and covers from middle school through college-level. It is sa great resource for biology and math teachers.
It is a wonderful tool that teachers can use for any type of students. It offers a variety of entry points that are useful for teachers that have an heterogeneous class.
How I Use It
I use as a warm-up at the beginning of my lesson. It is good for visual learners as well for ELL, special needs, and advanced learners.