Plants in Space // Relativity

Former undergraduate researcher Elizabeth Lombardi talks with Professor Barbara Demmig-Adams in the greenhouse on the roof of the Ramaley building at the University of Colorado Boulder. (Photo by Casey A. Cass/University of Colorado)

Plants in Space (start time 04:36) What would you miss if you were to spend an extended time in space—driving a car? Going to the movies? Hiking? Playing with your dog? Gravity, maybe? Or maybe something as simple as eating good, nutritious vegetables. How On Earth’s Beth Bartel speaks with University of Colorado undergraduate researcher Lizzy Lombardi about harvesting healthier veggies for our astronauts. Or, as we like to think about it, plants in space.

What Is Relativity? An Intuitive Introduction to Einstein’s Ideas, and Why They Matter by Jeffrey Bennett Relativity (start time 13:30) Albert Einstein published his special theory of relativity in 1905 and his general theory in 1915. Special relativity revealed bizarre and powerful ideas, including the famous equation E=mc2, but the basic theory hinges on a single realization: all observers, no matter how fast they are moving, always measure the same speed of light in space. A decade later, general relativity, the result of Einstein’s “happiest thought” that “the gravitation field has only a relative existence” unseated Newton’s law of gravitation. General relativity has passed every observation trial—so far. Relativity is important in everyday experience, for example enabling the incredible accuracy of the Global Positioning System, but the theory, especially the general form, can be a tough mathematical challenge. Boulder astrophysicist Dr. Jeffrey Bennett’s just-published book, What Is Relativity? An Intuitive Introduction to Einstein’s Ideas, and Why They Matter, gently straightens the curved spacetime. Join Jeff and host Jim Pullen live in the studio to learn why ‘black holes don’t suck’!

 

Hosts: Beth Bartel and Jim Pullen
Producer: Beth Bartel
Engineer: Jim Pullen
Executive Producer: Jim Pullen
Additional contributions: Jane Palmer

Listen to the show:

Play
Share

Big Game, Warm World // Hour of Code

Bull_elk_bugling_in_the_gibbon_meadow_in_the_yellowstone_national_parkBig Game and Climate Change (start time 5:00) Last week, the National Resource Council released some serious warnings about climate change, saying its impacts could be abrupt and surprising. But as How on Earth contributor Brian Calvert reports, the National Wildlife Federation says big game is already getting hit. Species from mule deer to antelope to bear are all dealing with climate change in their own ways. Only elk are faring better, at least for now. All of that could mean serious changes for Colorado’s hunters and wildlife watchers, says, Dr. Doug Inkley, the senior wildlife biologist for the organization and the lead author of a recent report, “Nowhere to Hide: Big Game Wildlife in a Warming World.”

Cu_computer_scienceHour of Code (start time 12:30) Coding is not just a magic trick where ones and zeros make Angry Birds. But it can be surprisingly simple to learn. You can do it in an hour. But you might want to use a game built by a team here at CU-Boulder. The tutorial is being offered as part of Computer Science Week. In the studio with How On Earth’s Joel Parker to explain the university’s so-called “Hour of Code” is Alex Repenning, a computer science professor at CU.

Hosts: Brian Calvert, Joel Parker
Producer: Brian Calvert
Engineer: Jim Pullen
Executive Producer: Beth Bartel

Listen to the show:

Play
Share

Parallel Universes

The concept of a parallel universe, a universe remarkably like our own but with some subtle difference, has been the staple of science fiction stories for years.  But it is an idea that is seriously discussed in real science starting many decades ago when physicists wrestled with the weird implications of Quantum Mechanics, and recently has appeared in many other guises in other areas of physics. One of the leading scientists in studying these ideas and explaining the mind-bending concepts to non-experts is Professor Brian Greene.  Dr. Greene is professor of physics and mathematics at Columbia University and co-founder and director of the Institute for Strings, Cosmology and Astroparticle Physics.  He has written the books The Elegant Universe and The Fabric of the Cosmos, both of which were adapted into mini-series on NOVA, and his most recent book is The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos.  We talk with him about the different concepts in modern day physics that point to the possibilities of parallel universes, what they may be like, and what observations and measurements may be able to prove or disprove their existence. (you can hear the extended interview with Dr. Greene)

Hosts: Joel Parker, Jim Pullen
Producer: Joel Parker
Engineer: Jim Pullen
Executive Producer: Shelley Schlender

Listen to the show:

Play
Share

Parallel Universes – extended interview with Brian Greene

This is an extended version of the interview we broadcast on February 26, 2013, featuring Professor Brian Greene discussing the concepts of Parallel Universes.

Play
Share

Support KGNU


How On Earth is produced by a small group of volunteers at the studios of KGNU, an independent community radio station in the Boulder-Denver metro area. KGNU is supported by the generosity and efforts of community members like you. Visit kgnu.org to learn more.

Podcast

Subscribe via iTunes
 
How On Earth episodes can be downloaded as podcasts via iTunes, or streamed to a mobile device via Stitcher or Science360 Radio.
 
Listen on Stitcher
 
Listen on Science360 Radio
 
For more info about podcasting, and more subscription options, visit our Podcast page.