Light travels in interesting ways through the solar system. A video episode from a longer series highlights how the sun's rays travel to the earth and moon and sometimes in between. Scholars learn about reflection properties on a very...

What is the biggest threat to a mass number of humans? Not natural disasters, but rather, pandemics! With a lecture and slide show, the speaker discusses how medical technology in the form of vaccines is bringing an end to suffering and...

Enhance grammar instruction with a video highlighting verbs and verb phrases. Get insight into what verbs are, the different types of verbs, and what makes a verb phrase. Following the lesson, an interactive pop quiz and review concludes...

It all depends what is given. The section of a large geometry playlist discusses the two formulas for finding the circumference of a circle. With the aid of the formulas, the presenter demonstrates finding the distance around circles in...

It's looking like the dark side is bigger than we thought! Physicists speculate that perhaps 96% of the universe consists of invisible dark matter and dark energy, while only 4% is what we can view with the aided eye. This flabbergasting...

Apply the trig ratios to find unknown angle measures. Learners review the side and angle relationships in right triangles and then apply the ratios to find the angle measures. The video shows several worked-out examples applying all...

Investigate the relationship between the gradient, or slope, of a line and its graph. Pupils learn to use a graph to calculate the slope of a line. The video lesson includes both positive and negative slopes and compares the steepness of...