Topic: Why Is It? Questions

March 9, 2017 Mountain High - Have you ever been to a high altitude and found yourself gasping for breath? One listener asked why that happens.
December 9, 2016 Sitting Close to the TV - A Science Update listener asks if sitting too close to the television can hurt your eyes.
December 1, 2016 24-Hour Colds - Why you sometimes feel a cold coming on, only to have the symptoms disappear the very next day.
November 30, 2016 Similar Snowflakes - A listener asks: Why do snowflakes appear so similar to each other?
November 28, 2016 Star Distance - Astronomers calculate the distance to the furthest stars by comparing them to stars they know.
July 8, 2016 Metal in Microwaves - If metal isn’t supposed to go in microwave ovens, why do some of them have metal racks?
April 8, 2016 Space Elevator - Could a “space elevator” carry supplies to the International Space Station?
March 1, 2016 Why Are Plants Green? - The dominance of green chlorophyll on Earth may have come after a more purple period.
February 8, 2016 Untying Laces - Why won’t shoelaces stay tied?
January 15, 2016 Baby Tooth Cavities - Baby teeth fall out eventually. But that doesn't mean cavities in baby teeth should be ignored.
January 5, 2016 Nesting Dogs - A listener asks why dogs sometimes turn around in circles before lying down.
December 8, 2015 Distinguishing Dinos - A listener asks how paleontologists know which species a dinosaur’s bones belong to.
November 20, 2015 Trees vs. Climate Change - Are coniferous or deciduous trees best at sucking up CO2?
November 5, 2015 Invisible Frogs - A Science Update listener wants to know the identity of a nightly neighborhood noisemaker.
September 18, 2015 Dinosaur Watching? - Is your bird feeder a window back to the Cretaceous period?
June 24, 2015 Pluto Close Up - How clear will Pluto’s next snapshots be?
December 1, 2014 Yaupon Tea - Can you get a caffeine fix without growing your carbon footprint?
December 4, 2013 Metal in Microwaves - If metal isn’t supposed to go in microwave ovens, why do some of them have metal racks?
October 11, 2013 Earth’s Tilt - A listener asks how the earth's tilt is measured.
September 5, 2013 Baby Tooth Cavities - Baby teeth fall out eventually. But that doesn't mean cavities in baby teeth should be ignored.
August 26, 2013 Metal in Microwaves - If metal isn't supposed to go in microwave ovens, why do some of them have metal racks?
August 9, 2013 Credit Card Fraud - How do cyber criminals steal your credit card information?
May 16, 2012 Spoiled Milk - A listener asks why milk goes bad more quickly than other beverages.
February 6, 2012 The Sun’s Temperature - A listener asks: How hot is the surface of the sun?
December 30, 2011 Podcast for 30 December 2011 - DRUGS & ROCK 'N ROLL - Predicting drug side-effects before they can harm patients. A blood test for antidepressant effectiveness. Is 27 really an unlucky number for famous musicians? Are collecting and hoarding related? And why babies favor vigilante justice.
December 28, 2011 Collecting & Hoarding - A listener asks why some people become collectors and hoarders.
August 10, 2011 Hot Flashes - A listener asks: What causes hot flashes?
August 1, 2011 Ultrasound Safety - A listener asks: Can medical ultrasound damage your ears?
June 23, 2011 A Nestling Mystery - A listener asks: How do baby birds get enough water when they’re still in the nest?
May 25, 2011 Tsunamis & Sealife - A listener asks: What happens to the seafloor and to sealife when tsunamis hit?
April 13, 2011 Vitamin C & Pasteurization - A listener asks if pasteurizing orange juice destroys its vitamin C.
March 14, 2011 Slimy Frog Skin - A listener asks: Why is frog skin slimy?
March 10, 2011 Star Distance - Astronomers calculate the distance to the furthest stars by comparing them to stars they know.
March 1, 2011 Poison Pits - A listener asks whether it's safe to eat fruit seeds and pits.
October 21, 2010 24-Hour Colds - Why you sometimes feel a cold coming on, only to have the symptoms disappear the next day.
October 6, 2010 Edgy Clouds - A listener asks why clouds have such well-defined edges.
September 23, 2010 Exercising Illness - A listener asks: can exercise stave off illness?
September 14, 2010 Pigeon Illusions - A listener asks: Why do pigeons bob their heads back and forth when they walk?