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Ask Dr. Universe rcwebber

Dr. Universe: Do babies have ways of communicating? –Jalen, 12, North Carolina

Dear Jalen, Babies can communicate in a few different ways. For the most part, they use their emotions. Humans come into the world crying, but that’s actually a good thing. In a way, babies start communicating from the moment they are born. Of course, it can be hard for their caregivers to know exactly what they mean with all those cries. Read More ...

Dr. Universe: How do you make a snow globe? – Alexa, 10, Salem, MO

Dear Alexa, If you have a long winter break ahead and are looking for a great way to spend the afternoon, you might just want to make your very own snow globe. There are a few different ways to build a snow globe, but the first thing you’ll need is the perfect container. To make a small snow globe, you might use something like an empty baby food jar. Or maybe if you want to make a bigger snow globe, you could choose an empty spaghetti sauce jar. Read More ...

Dr. Universe: Why are evergreen trees green all year? – Emily, 10, Silverdale, Wash.

Whenever I go for a hike in the woods, I can’t help but admire the tall evergreen trees. No matter what time of year it is, the pines, hemlocks, cedars, and spruces are usually all green. My friend Bert Cregg is also very curious about the lives of trees. He graduated from Washington State University and is a professor at Michigan State University. Read More ...

Dr. Universe: Why do microwaves hum? – T.J., Middle School, Ohio

Dear T.J.,

Long before humans invented microwave ovens, they had to rely on stoves or an open flame to heat up their food.

These days, we can warm up food in a matter of minutes, or even seconds. A lot of parts had to be invented to make that all happen. These parts help electricity flow through the microwave in lots of different ways.

One part called a transformer helps move the electricity from one area to another. As it does so, it may vibrate or shake a little, and that tiny movement can cause a humming noise.

Electricity is actually a big part of … » More …

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Dear Dr. Universe: How do people name continents or places on earth? Thank you. - Lila Grace, 8, Virginia

Our world is full of so many different places. They get their names in lots of different ways. One way a place might get a name is from the person who explored it. The Americas are named after an Italian explorer, Amerigo Vespucci. But Amerigo wasn’t the first person to explore these continents. There were already people living there when he arrived. Still, “America” was named after Amerigo. For the most part, people name things because they are claiming possession of a place. Because of that, sometimes the original names of places are lost or erased. That’s what I found out from my friend Theresa Jordan, a history professor who teaches a geography course at Washington State University. Read More ...

Dr. Universe: How do cows make milk? How do humans get milk from a cow? – John, 4, Colton, Ore.  

Quite a few things have to happen for a cow to make milk. First, the cow has to eat lots of food, such as hay, grass, or grain. You may have heard that a cow will regurgitate her food, or sort of spit it up, and then chew on it again.   A cow will chew this mashed up food, or her cud, so she can get all the good stuff out of it—protein, sugar, fat, vitamins, and other nutrients. Milk is actually mostly water, plus those good nutrients.   Read More ...

Why do we have eyebrows? -Zach, 11, Kettle Falls, Wash.

Dear Zach, Humans have hair on their heads, arms, and as you mention, even the face. If you feel your face, you might feel some small, fuzzy hairs on your cheeks and forehead. But the hair of your eyebrows is usually a bit thicker. I asked my friend Mark Mansperger why we have eyebrows. He’s an anthropologist at Washington State University. Eyebrows appear to serve two main purposes, he said. One of the purposes of eyebrows is to keep things like rain or sweat from rolling down your forehead and into your eyes. “It guards your eyes in that way,” Mansperger says. Read More ...

Dr. Universe: Why does the moon have phases? – Manahil, 14, Pakistan

When astronomers looked at the night sky long ago, they also wondered about questions just like this one. You know, I was also curious about why the moon looks so different at different times of the month. I visited with my friend Jose Vazquez, an astronomer at Washington State University, to learn more about it. He said that the way the moon looks to us has to do with two other objects in our solar system: our sun and earth. Read More ...