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Scientists Have Figured Out the Physics of Perfect Bubble Blowing

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Bubble blowing is an art form children have been trying to perfect for generations. Now a group of French scientists may have finally calculated the physics behind mastering the form, Science News reports. 

The study, recently published in the journal Physical Review Letters, suggests that it's not the thickness of your soapy film, but the force with which you blow that determines a bubble's formation. To gather their data, the researchers constructed a mechanism that would allow them to regulate the thickness of the soap and the width of the opening it covered. They then used a nozzle to blow precise gusts of air, light helium, or heavy sulfur hexaflouride gas into the film. You can watch part of the experiment in the video below. 

They found that the minimum blowing speed for bubble-making is between 10 meters and 100 meters per second. Anything weaker than that caused a slight dimple to appear on the film without pushing out a fully formed bubble. The study was performed with a device significantly larger than what most kids use (about 1 meter tall), but they were able to replicate the results using a regular-sized bubble wand. 

Bubbles have been the focus of scientific research for centuries. They've been used in everything from propelling Russian torpedoes to acting as the bits in a computer. These new findings could be helpful to scientists studying bubbly substances (like foams) in the future. They can also be useful to anyone looking to improve their bubble-blowing skills. 

[h/t Science News]

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© 2017 USPS
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Pop Culture
Speedy Delivery: Mister Rogers Will Get His Own Stamp in 2018
© 2017 USPS
© 2017 USPS

USPS 2018 Mister Rogers stamp
© 2017 USPS

After weeks of mailing out this year’s holiday cards, postage might be the last thing you want to think about. But the U.S. Postal Service has just given us a sneak peek at the many iconic people, places, and things that will be commemorated with their own stamps in 2018, and one in particular has us excited to send out a few birthday cards: Mister Rogers.

In celebration of the 50th anniversary of Mister Rogers’ Neighborhood, Fred Rogers’s groundbreaking PBS series that the USPS says “inspired and educated young viewers with warmth, sensitivity, and honesty,” the mail service shared a mockup of what the final stamp may look like. On it, Rogers—decked out in one of his trademark colorful cardigans (all of which were hand-knitted by his mom, by the way)—smiles for the camera alongside King Friday XIII, ruler of the Neighborhood of Make-Believe.

Though no official release date for Fred’s forever stamp has been given, Mister Rogers is just one of many legendary figures whose visages will grace a piece of postage in 2018. Singer/activist Lena Horne will be the 41st figure to appear as part of the USPS’s Black Heritage series, while former Beatle John Lennon will be the face of the newest Music Icons collection. Sally Ride, the first American woman in space, will also be honored.

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Smart Shopping
11 Gifts for the Curious Kids in Your Life

No matter their age, you want to find gifts that will keep the kids in your life entertained, stimulated, and give them a sense of accomplishment—even during playtime. Luckily, these 11 gifts will do all of that, and will encourage their curiosity to grow.

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1. RACE ACROSS THE USA; $22

Race Across the USA
Young Explorers

Want to get kids excited about the next big family road trip? Or give them some talking points about their favorite aunt’s home state? This board game helps them understand the geography of the U.S., as well as trivia on each of the 50 states and the major landmarks and capitals.

Find It: Young Explorers

2. ROOT-VUE FARM; $35

Whether they join FFA or not, kids can get a head start on understanding horticulture with this indoor garden system. Plant any root vegetable—carrots, radishes, onions, etc—and watch them obsess over the underground view of their harvest.

Find It: Young Explorers

3. DROID INVENTOR KIT; $100

This is definitely the droid you’re looking for. Recommended for kids in grades 3 to 8, this customizable robot comes with an app that defines more than a dozen missions for kids to send their creations on. And for any Star Wars fans, the Droid makes 20 different sounds, just like from the movies.

Find It: littleBits

4. SPEEDY RACER BILINGUAL LAPTOP; $26

Speedy Racer Bilingual Laptop
Imagine Toys

Kids ages 3 and up can play games, make their own music, and work on language, math, and memory skills with this activity-filled laptop. Plus, the English/Spanish component will help enhance the child’s fluency in both languages.

Find It: Imagine Toys

5. BIKE CHALK TRAIL KIT; $20

Bike Chalk Trail Kit
Uncommon Goods

Think beyond the coloring book. By attaching thick, non-toxic chalk to the back of a bike, kids can work on increased spatial awareness, collaborative drawings with friends, and may perhaps have a greater appreciation for the large-scale, colorful work of a Basquiat or Pollock.

Find It: Uncommon Goods

6. ROCKET SCIENCE DRESS; $30

For little girls who want to shoot for the stars, this Katherine Johnson-inspired dress illustrates her human-calculator abilities as drawn out on a chalkboard. Rocket propulsion simulation, gravity loss equations, etc. You know, the basics.

Find It: Svaha

7. 3DOODLER 3D PRINTING PEN SET; $43

3Doodler 3D Pen Set
Amazon

This wireless pen allows kids to freestyle draw in the air—the eco-plastic filament cools in place quickly, giving kids plenty of practice with spatial reasoning without the costs of a full 3D printer.

Find It: Amazon

8. A COMPREHENSIVE CURTAIN CALL OF BROADWAY COSTUMES; $29

A Comprehensive Curtain Call of Broadway Costumes
Pop Chart Lab

For musical-obsessed kids, this curtain call of famous costumes can serve as a checklist for any Broadway productions they haven't seen (or, more likely, memorized the cast recording and seen the movie version of) yet. Perennial children's favorites like Annie, Grease, and Wicked are included, but you might want to have an answer ready for when your preteen cousin asks to watch Cabaret.

Find It: Pop Chart Lab

9. THE PLAY GYM BY LOVEVERY; $140

The Play Mat by Lovevery
Amazon

Specially designed by experts to stimulate infants for their first year, this play mat grows with your favorite baby. It has five developmental zones in addition to 24 different stage-based activities—like teethers, mirrors, and colorful flash cards. And, when baby becomes a toddler, the mat converts into a tent fort for further imaginative play.

Find It: Amazon

10. STOP MOTION ANIMATION KIT; $60

Stop Motion Animation Kit
Uncommon Goods

Budding animators who need to fine-tune their skills (and patience!) will spend hours moving these silly characters around slowly, photographing their adventures, and editing the film into mini-movies.

Find It: Uncommon Goods

11. PRESCHOOL KIDNOCULARS; $15

Kidnoculars
Young Explorers

Kid-proof and specially designed for tiny hands and faces, these binoculars can help preschoolers get to know the world around them. Play a game like “I Spy” and have them find squirrels in trees, clouds in the sky, or all those Cheerios they spilled behind their bed.

Find It: Amazon

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