Finding and Measuring What You Can't See

How did ancient peoples determine the height of really tall objects? Young scientists and mathematicians explore the concept of using shadows to measure height in a hands-on experiment. Paired pupils measure shadows, then calculate the...

Pupils learn everything from how to take scientific measurements, to accuracy/precision, to density and a plethora of topics from a presentation on the metric system.

Many assume light intensity decreases proportionally to your distance from the sun. An interesting video discusses why this isn't true and what actually happens. It shares the flashes of light people would observe and then compares what...

DNA forms a double helix, but that is not what it looks like. A fact-filled video takes on this inaccuracy as part of an extensive playlist on biology. It shares the recent discoveries about what DNA looks like as well as the many...

It's hard to explain stuff you can't see! But, this animated stick-figure drawing describes dark matter and how we know it exists. It likens the galaxy to a merry-go-round, holding the stars on their circular path. The one-minute...

If you can't see something, how do you know it's there? Welcome to the mystery of dark matter! Curious cosmologists explore one of physics' longest-running quandaries through an interesting video. Content includes who first proposed the...

It's difficult to believe in what you cannot see. A video presentation outlines evidence to convince scholars of the idea that there is no end to the universe. A video takes viewers on a trip through history to show learners how our...

How do we see what we can't see? An episode of a comprehensive physics playlist shows images of the smallest particles current technology can record. The instructor discusses current and past research on the makeup of subatomic particles.

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...

What will viewers see when they watch this video about vision? They will observe RJ and Sam hanging out during a power outage with Rookie, the dog. The boys discuss the structure of the eye (pupil, iris, cornea, lens, retina, optic...