Episodes

Too Big to Prove
Oct 16, 2017
Gravitational waves, string theory, and modern physics

Celebrations are in order for the physicists who won the 2017 Nobel Prize, for the detection of gravitational waves.  But the road to Stockholm was not easy.  Unfolding over a century, it went from doubtful theory to daring experiments and even disrepute.  100 years is a major lag between a theory and its confirmation, and new ideas in physics may take even longer to prove.


On Defense
Oct 09, 2017
Protection strategies.

ENCORE  The military is a dangerous calling.  But technology can help out, so researchers are constantly trying to make soldiers safer.  Writer Mary Roach investigates how scientists studying so-called human factors are protecting troops from such aggressive foes as heat, noise, and fatigue.  She also learns how bad odors were once considered a secret weapon.


It's In Material
Oct 02, 2017
New constructs in construction stuff.

Astronauts are made of the “right stuff,” but what about their spacesuits?   NASA’s pressurized and helmeted onesies are remarkable, but they need updating if we’re to boldly go into deep space.   Suiting up on Mars requires more manual flexibility, for example.  Find out what innovative materials might be used to reboot the suit.


Aliens - The Evidence
Sep 25, 2017
Make your best case.

ENCORE  Once again the aliens have landed … in theaters.  It’s no spoiler to say that the latest cinematic sci-fi, Arrival, involves extraterrestrials visiting Earth. 

But for some folks, the film’s premise is hardly shocking.  They’re convinced that the aliens have already come.  But is there any proof that aliens are here now or that they landed long ago to, for example, help build the Egyptian pyramids?

Meanwhile, SETI scientists are deploying their big antennas in an effort to establish that extraterrestrials exist far beyond Earth.


Angles of a Hack
Sep 18, 2017
Meet the modern hackers.

Changed your computer password recently?  We all try to stay one step ahead of the hackers, but the fear factor is increasing.  The risks can range from stolen social security numbers to sabotaging a national power grid. 


Plan of a Hack
Sep 11, 2017
Meet the original hackers.

Long before cyber criminals were stealing ATM passwords, phone phreaks were tapping into the telephone system. Their motivation was not monetary, but the thrill of defeating a complex, invisible network. Today “hacking” can apply to cyberwarfare, biological tinkering, or even geoengineering.  Often it has negative connotations, but the original definition of “hacking” was something else.


Born Legacy
Sep 04, 2017
We fly on NASA's SOFIA to discover how stars are born.

ENCORE  We know how the stars shine, but how do you make a star?  We take an all-night ride on a high-flying jet – an airborne NASA observatory called SOFIA – to watch astronomers investigate how a star is born. (Listen to the show in the player above, and read our reporter Emma Bentley's account of her adventure here.)


Elements Never Forget
Aug 28, 2017
Periodic appearances.

ENCORE  It’s elementary, Watson.  Things are in flux – from the elements in the air you breathe to party balloons.   We investigate the massive, historic loss of nitrogen from the atmosphere and meet the culprits behind a modern-day helium shortage. 

But it’s not all a disappearing act: be thankful that oxygen showed up in our atmosphere a few billion years ago.  Meanwhile, atom smashers have recently produced some new elements.  Their appearance was brief, but long enough to fill out the periodic table.


Musical Universe
Aug 21, 2017
Sounds of silence.

ENCORE  In space, no one can hear you scream, but, using the right instruments, scientists can pick up all types of cosmic vibrations – the sort we can turn into sound.  After a decade of listening, LIGO, a billion-dollar physics experiment, has detected gravitational waves caused by the collision of massive black holes, a brief shaking of spacetime that can be translated into a short squeal. 

We listen to the chirp of black holes crashing into each other and wonder: could the universe contain more than individual sounds, but have actual musical structure? 


On Thin Ice
Aug 14, 2017
Climate change as icebreaker.

Water is essential for life – that we know.  But the honeycomb lattice that forms when you chill it to zero degrees Celsius is also inexorably intertwined with life.

Ice is more than a repository for water that would otherwise raise sea levels.  It’s part of Earth’s cooling system … a barrier preventing decaying organic matter from releasing methane gas … and a vault entombing ancient bacteria and other microbes. 

From the Arctic to the Antarctic, global ice is disappearing.   Find out what’s at stake as atmospheric CO2 threatens frozen H2O. 


Adam Savage
Aug 07, 2017
But is it science?

ENCORE  Can an opera singer’s voice really shatter glass?  Can you give your car a rocket-assisted boost and survive the test drive?  How do you protect yourself from a shark attack?   Those are among the many intriguing questions and urban legends tested by the MythBusters team in front of the camera.

Now that the series has ended after a 16 year run, co-host Adam Savage tells us how it all began, how he and Jamie Hyneman walked the line between science and entertainment, and why he considers himself a scientist but not a “skeptic.”


Caught in a Traps
Jul 31, 2017
Volcanos and quakes.

ENCORE  “Locked and loaded” is how one scientist recently described the San Andreas fault.  Find out when this famous west-coast rift might cause “the big one;” also, the state of early earthquake warning systems.

Plus, another sign of our planet’s unceasing turmoil: volcanos!  Could the eruption that produced the Deccan Traps, and not a rock from space, have been the nail in the coffin for the dinosaurs?  One seismologist shares new evidence about some suspicious timing.


What Goes Around
Jul 24, 2017
How to recycle nearly everything.

It’s not just tin cans and newspapers.  One man says that, from a technical standpoint, everything can be recycled – cigarette butts, yoga mats, dirty diapers.  Even radioactive waste.  You name it, we can recycle it.  But we choose not to.  Find out why we don’t, and how we could do more. 

Plus, a solar-powered device that pulls water from the air – even desert air. 

And, something upon which life depends that seems dirt cheap, but can’t be replenished: soil.  What happens when we pave over this living resource? 

Guests:


Eclipsing All Other Shows
Jul 17, 2017
Excitement builds for the 2017 solar eclipse.

They say that the experience of watching a total eclipse is so profound, you’re not the same afterward.  If life-changing events are your thing and you’re in the lower 48 states on August 21st, let us help you make the most of viewing the Great American Solar Eclipse.

Learn the basics of where to be and what to bring, even on short notice. No eclipse glasses?  Find out why a kitchen colander is an excellent Plan B.

Also, the strange behavior of animals and private jet pilots during an eclipse.  The latter is making the FAA sweat.


Frogs' Pants
Jul 10, 2017
Clever experiments to define and detect life.

It’s one of the most bizarre biological experiments ever. In the 18th century, a scientist fitted a pair of tailor-made briefs on a male frog to determine the animal’s contribution to reproduction.  The process of gestation was a mystery and scientists had some odd-ball theories.  

Today, a 5th grader can tell you how babies are made, but we still don’t know exactly what life is.  In our quest to understand, we’re still at the frogs’ pants stage.


Rational Lampoon
Jul 03, 2017
Why you know much less than you think you do.

Two heads may be better than one.  But what about three or more?  A new study shows that chimpanzees excel at complex tasks when they work in groups, and their accumulated knowledge can even be passed from one generation to the next. 

But group-think also can be maladaptive.  When humans rely on knowledge that they assume other people possess, they can become less than rational.

Find out why one cognitive scientist says that individual thinking is a myth.  Most of your decisions are made in groups, and most derive from emotion, not rationality.


Skeptic Check: How Low Can You Go?
Jun 26, 2017
Cryotherapies.

ENCORE  Baby, it’s cold outside… but you still might want to be there.  Some people claim that chilly temperatures are good for your health, and proponents of cryotherapy suggest you have a blast – of sub-zero air – to stave off wrinkles and perhaps halt aging altogether. 

Meanwhile the field of cryonics offers the ultimate benefit by suggesting that you put future plans – and your body – on ice when you die.  That way you might be revived when the technology to do so is developed.


Perpetual Emotion Machine
Jun 19, 2017
Compassionate computers and irrational human behavior.

Get ready for compassionate computers that feel your pain, share your joy, and generally get where you’re coming from.  Computers that can tell by your voice whether you’re pumped up or feeling down, or sense changes in heart rate, skin, or muscle tension to determine your mood.  Empathetic electronics that you can relate to.


Science Fiction
Jun 12, 2017
Why it works.

ENCORE  No one knows what the future will bring, but science fiction authors are willing to take a stab at imagining it.  We take our own stab at imagining them imagining it.  Find out why the genre of science fiction is more than a trippy ride through a bizarre, hi-tech world, but a way to assess and vote on our possible shared future. 


Gene-y in a Bottle
Jun 05, 2017
CRISPR technology

ENCORE  You can’t pick your parents.  But soon you may be able to change the DNA they gave you.  CRISPR technology is poised to take DNA editing to new levels of precision and speed.  Imagine deleting genes from your body that you don’t like and inserting the ones you want.  The swap might not even require a fancy lab.  Biohackers are already tinkering with genes in their homes.  

Find out how CRISPR technology might change everything when the genetic lottery is no longer destiny.