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PBS
The Crisis in Cosmology
The search for a single number: the hubble constant, which is the rate of expansion of our universe, has consumed astronomers for generations. Finally, two powerful and independent methods have refined its measurement to unprecedented...
PBS
Sound Waves from the Beginning of Time
Invisible to the naked eye, our night sky is scattered with the 100s of billions of galaxies the fill the known universe. Like the stars, these galaxies form constellations – hidden patterns that echo the reverberations of matter and...
PBS
Our Antimatter, Mirrored, Time-Reversed Universe
The foundations of quantum theory rests on its symmetries. For example, it should be impossible to distinguish our universe from one that is that is the perfect mirror opposite in charge, handedness, and the direction of time. But one by...
PBS
Perpetual Motion From Negative Mass?
Challenge question: if 1kg of apples is $5 and 2kg is $10, how much is -1kg of apples? The answer? Priceless. Because you could use negative-mass apples to build warp drives, travel in time, and construct a perpetual motion machine. In...
Loyola University Chicago
Math Flix: Symmetry Using the Alphabet
This QuickTime movie uses the alphabet to illustrate the basic geometric term, symmetry. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.
Loyola University Chicago
Math Flix: Symmetry Intro 2
This QuickTime movie further develops the introduction to this basic geometric term, symmetry, by creating several several objects with lines of symmetry. As you watch and listen to the teacher and student interact it helps clarify the...
Loyola University Chicago
Math Flix: Symmetry Intro 1
This QuickTime movie provides an introduction to the basic geometric term, symmetry. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.