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Moment of Um

Author: American Public Media

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Moment of Um is your daily answer to those questions that pop up out of nowhere and make you go… ummmmmmm. Brought to you by your friends at Brains On at APM Studios.
142 Episodes
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How do records work?

How do records work?

2024-12-2007:31

Records are big flat discs with circular lines on them that you can use to play music. But how does a record work, anyway? We asked audio engineer Josh Bonati to help us find the answer.Got a question that’s spinning around in your brain? Send it to us at BrainsOn.org/contact, and we’ll help find an answer that’s music to your ears!
Airplanes fly high in the sky and at super fast speeds. But is there a limit to how fast they’re allowed to fly? You know, in the way cars have speed limits? For this episode, we talked to Bobby Sharp, an air traffic controller, who helps us understand if airplanes have a need for speed.Got a question you need answered fast? Send it to us at BrainsOn.org/contact, and we’ll try our plane old best to get it answered!
Have you ever been to the doctor and had them listen to your body with a stethoscope? It’s that funny looking thing that looks like a long rubbery tube with a round metal circle on one end and two ear pieces on the other. Doctors always seem to have one handy, but what is it and how does it work? We asked pediatrician Emma Gerstenzang to help us find the answer.Got a question that you need scoped out? Send it to us at BrainsOn.org/contact, and we’ll prescribe you an answer!
Most of us know that we have a heart. We know that it beats - sometimes faster, sometimes slower. But just how many times does it beat in a day? We asked Dr. Courtney Jordan Baechler to have a heart-to-heart with us about this question. (She is also the host of the podcast Heart-to-Heart Conversations!)Got a question that you just love? Send it to us at BrainsOn.org/contact, and we won’t beat around the bush!
How do sinkholes form?

How do sinkholes form?

2024-12-1606:54

Have you ever seen a sinkhole? These are spots in the Earth’s surface where the ground has collapsed and formed a hole. Sometimes they can be more than a hundred feet deep! But how do sinkholes form? We asked geologist Hazel Barton to help us find the answer.Got a question that’s a real hole in one? Send it to us at BrainsOn.org/contact, and we’ll help dig up the answer!
Black holes are super dense spots in space. They have so much gravity that when something falls into a black hole, it can’t escape. We asked UCLA astrophysicist Dakotah Tyler to help us imagine what it would be like if we traveled through one of these dark marvels.Is there a question that’s really pulled you in? Send it to us at BrainsOn.org/contact, and we’ll spaghettiFIND you an answer!
3D glasses. Those little paper spectacles with one red lens and one blue. Put ’em on, and suddenly, POW! Images seem to leap right off the screen! Do these glasses play magical mind tricks on our brain? Do they give our eyeballs multi-dimensional superpowers? For a lens into how it all works, we talked to UW-Madison physicist Pupa Gilbert.Got a question that’s really jumping out at you? Send it to us at BrainsOn.org/contact, and we’ll help you put it into focus.
Vocal cords are magical things. They let us speak, sing, squawk and scream. But what are vocal cords and how do they do all that? We asked pediatrician Emma Gerstenzang to help us find the answer.Got a question that’s chattering away in your brain? Send it to us at BrainsOn.org/contact, and we’ll belt out an answer!
If you could turn your hair any color in the world… what color would you choose?! Sapphire blue, hot pink, lime green, neon orange?? There are dyes out there that can turn your hair every color of the rainbow! But how exactly do they work? We asked Chemist Michelle Wall to help us understand.Got a hairy question that needs answering? Send it to us atBrainsOn.org/contact, and we’ll style an answer for you!
How are bricks made?

How are bricks made?

2024-12-0905:43

Bricks are all around us: in walls, sidewalks, park benches, and more. How are these bodacious blocks made, and what makes them different colors?  We asked construction and masonry expert Brian Trimble to help us find the answer.Constructing a question? Send it to us at BrainsOn.org/contact, and we’ll help you find a solid answer!
People around the world eat with a variety of utensils like forks, chopsticks, and sporks. But what did people do before silverware was invented? We asked human evolution expert Briana Pobiner from the Smithsonian National Museum of Natural History to help us find the answer.Got a question that’s unFORKgettable? Send it to us at BrainsOn.org/contact, and we’ll spoon-feed you an answer. 
Clothes are FUN. We strut our stuff in them. Laugh and play in them. Sometimes we love one article of clothing so much, we never want to take it off! But eventually, all clothes do have to be cleaned. We chatted with Tide Principal Scientist Jennifer Ahoni about how clothes get dirty, even when they still look spotless. Listen and learn about the secrets of body soils and invisible dirt! Got a question in your pocket? Send it to us atBrainsOn.org/contact, and we’ll fashion an answer for you.
Have you ever noticed that when you eat something salty, you feel extra thirsty for a while afterwards? Ever wondered why? Turns out, scientists are wondering why as well, and it’s a perfect example of how science is always changing how we understand the world. Gastroenterologist Dr. Kaveh Hoda tells us the salty story. Thirsting for knowledge? Send it to us at BrainsOn.org/contact, and we’ll conSALT all our resources to find the answer!
Bread! It’s good stuff, no matter how you slice it. But why do slices of bread have holes in them? Are there bread moles who tunnel through baguettes? Invisible worms in the whole wheat? Chipmunks chewing on the ciabatta? We asked food scientist David Domingues  to help us find the answer.Got a question that you knead us to look into? Send it to us atBrains On.org/contact, and we’ll find the answers where you yeast expect them!
Warts are small bumps that can show up on our skin, especially on our hands, knees, or elbows. What are they? Where do they come from? We asked Dr. Kaveh Hoda to help us find the answer.Got a question that’s got you TOADally stumped? Send it to us at BrainsOn.org/contact, and we’ll help sort out wart’s wart.
Platypuses seem like they were put together from other animal’s spare parts. They’ve got a bill like a duck, a flat tail like a beaver, and…venom? What’s up with that? We asked biologist Imogene Cancellare to help us find the answer.Got a question that’s as confusing as platypus anatomy? Send it to us at BrainsOn.org/contact, and we won’t even bill you for the answer!
Peregrine falcons are the fastest animals on earth. They’re the super sonic jets of the animal kingdom! So what does the word “peregrine” mean and how did these amazing birds get their name? We chatted with conservation biologist Imogene Cancellare to help us find the answer.Got a question soaring through your brain? Send it to us at BrainsOn.org/contact, and we’ll help you capture the answer!
When you picture a lion, what do you see? If you thought of a big fluffy mane, you’re not alone! But how come mountain lions don’t have manes? We asked conservation biologist Imogene Cancellare to help us find the answer.Got a question that’s really hairy?  Send it to us at BrainsOn.org/contact, and we’ll make finding the answer our mane focus.
Birds have a lot going on. They fly, chirp, sing, make nests, lay eggs. But can they cough or sneeze? We asked biologist Imogene Cancellare to help us find the answer.Got a question that’s flying around in your brain? Send it to us at BrainsOn.org/contact, and we’ll help quack the case.
Most bear species spend at least part of the winter season snoozing – a.k.a. hibernating! To prepare for that extended nap sesh, bears snuggle up in cozy dens where they can stay safe and hidden. But how does a bear make a den? We asked biologist Imogene Cancellare to help us find the answer.Got a question that’s making you feel a bit grizzled? Send it to us at BrainsOn.org/contact, and we’ll help i-DEN-tify the answer!
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