The Lighter Side of Science

Some St. Patrick’s Day Science: Green Rivers, Four-Leaf Clovers and Optics of a Good Pint

Posted on by Shannon Sindermann

St. Patrick’s Day means different things depending on where you are in the world. In Ireland, it’s a national holiday steeped in culture and tradition: parades, traditional music sessions and, for many, a pint of Guinness accompanied by a hearty “Sláinte” are all part of the day. Here in the American Midwest, we tend to turn that same spirit into a full spectacle. Green everything as far as the eye can see, including somehow an entire river.

Whatever your version of the holiday looks like, there is a lot of fun science behind it. Here is a look at Midwest St. Patrick’s Day through a lab lens.

The Chicago River: Where Orange Becomes Green

St. Patricks Day, Chicago River, Green

Every St. Patrick’s Day, the Chicago Journeymen Plumbers Local 130 heads out on the river and, in roughly 45 minutes, turns a stretch of the Chicago River a surreal emerald green (7, 11). The twist: the dye goes in orange.

The tradition dates to the early 1960s, rooted in a practical idea. Dye had been used to trace leaks and flow in the city’s waterways and someone realized the same concept could be repurposed into a public spectacle (7,11). The exact formula has been kept secret ever since, described only as environmentally friendly and designed to fade after a few hours (1,7,11).

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Light Has a Favorite Color, But It’s Complicated

Posted on by Elise Johnson

Last spring, my niece and I made a trip to a home improvement store to put together a Mother’s Day planter for my sister. My niece had a clear vision: my sister’s favorite color is blue, so we were going to buy blue flowers. We walked every aisle of the garden center. We checked the annuals, the perennials, and the hanging baskets then left with purple, red, and a grumpy 7-year-old.

It turns out we were not up against a bad selection. We were up against biology.

The Problem with Blue

Blue is one of the rarest colors in the natural world. The food industry is currently finding that out the hard way. There is a good chance you have eaten something blue today. Maybe it was the frosting on a birthday cake, the coating on some M&M’s® candies, or the sports drink in your refrigerator. That blue almost certainly came from a petroleum-based synthetic dye, and for the first time in decades, the food industry is being asked to find something better.

The FDA banned Red Dye No. 3 in January 2025, and pressure has been building around the remaining synthetic dyes ever since, including Blue No. 1 and Blue No. 2. Major food brands have begun announcing plans to reformulate.

There is just one problem. Blue is genuinely, stubbornly hard to make in nature. It turns out that blue has almost nothing to do with color, and almost everything to do with light.

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Do Mosquitoes Have a Taste for Beer?

Posted on by Shannon Sindermann

Festival season is here—and apparently, mosquitoes got tickets too.

If you have ever been the person in your friend group who ends a summer concert covered in large, itchy welts while everyone else goes home bite-free, you are not imagining things. Some people really are mosquito magnets.

Mosquito bite

A new study, aptly titled “Blood, Sweat, and Beers,” set out to uncover what makes certain humans irresistible to mosquitoes. But instead of a sterile lab or a rainforest expedition, this experiment took place at one of the Netherlands’ biggest music festivals; Lowlands, a three-day party with 65,000 attendees, questionable hygiene and plenty of beer. In other words: the perfect breeding ground for this science experiment.

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Ice Age Secrets: The Discovery of a Juvenile Sabretooth Cat Mummy 

Posted on by Shannon Sindermann

In the permafrost of Siberia, a remarkable discovery has been made—a mummified juvenile sabretooth cat, Homotherium latidens, frozen in time for over 35,000 years. This discovery, made along the Badyarikha River in the Indigirka River Basin of Yakutia, Russia, offers an exciting glimpse into a species that has no modern analog (a living equivalent of something extinct) (1). For paleontologists and evolutionary biologists, it provides an unprecedented look at an ancient predator that roamed the Earth during the Ice Age. So, how is this cub mummy truly fascinating scientists?  

A Rare Find  

Homotherium Sabretooth mummy
The frozen mummy of Homotherium latidens: (A) external appearance; (B) skeleton, CT-scan, dorsal view (1).

The permafrost of Siberia is a treasure trove of Ice Age fossils, but the discovery of a mummified Homotherium cub stands out for its rarity and significance. While bones can tell us a lot about the history of an extinct species, mummies—where the animal’s soft tissues, such as fur, skin and sometimes internal organs, are preserved—offer far more detailed information. ‘Mummies’ refer to animals (or humans) that have been preserved with their soft tissues intact, often through natural or intentional processes like drying or embalming. This preservation allows scientists to gain insights into the organism’s diet, health, development and adaptations—details that bones alone can’t reveal! 

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Thanksgiving Cooking: Lessons in Chemistry

Posted on by Shannon Sindermann
Thanksgiving dinner

With Thanksgiving just around the corner, kitchens across the country will soon be alive with the sights, smells and sounds of cooking. But what if we dove deeper into those recipe books and looked beyond the instructions? You might find you’re more than just a cook; you’re quite the chemist!  

Inspired by the popular show Lessons in Chemistry, an adaptation of Bonnie Garmus’s bestselling novel, cooking is presented as applied science, encouraging viewers to think critically about their cooking and the chemical reactions that create the flavors and textures they love. In this blog, we’ll explore the chemistry behind Thanksgiving cooking, revealing how different techniques bring out the best in each dish. 

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Extreme Makeover, Epidemic Edition: Can Ants Modify Their Nests for Survival?  

Posted on by Shannon Sindermann
Ants on a hill

Imagine if your first instinct during an epidemic wasn’t to wear a mask or stock up on groceries, but instead to start rearranging and remodeling your house. As it turns out, researchers have found that black garden ants (Lasius niger) do exactly that when confronted with the threat of disease. These tiny architects instinctively spring into action, redesigning their nests in various ways to slow the spread of infection and protect their crowded colonies where diseases can easily spread.  

Read more about the research and see how these findings offer insights into how spatial changes – both in ants and potentially in human environments – can help limit the risks of infection.  

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Taking the Plunge: How the Seine Became Olympic-Ready

Posted on by Shannon Sindermann

What would the Olympics be without a little controversy? From spy drones to air conditioning battles and debates over the bronze medal in women’s floor exercises, the 2024 Games had their fair share. Yet, amidst all the drama, one story stood out—the transformation of the Seine River. After being off-limits to swimmers since 1923, the Seine made a historic comeback this summer, hosting Olympic swimming events for the first time in modern history, including a 10K marathon, the aquatic portion of the triathlon and a Paralympic swimming event (4). With nearly 1 billion people watching, the Seine needed to be more than just swimmable – it had to be media-ready, as even a small misstep could have tarnished the river’s new image. 

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How Artificial Intelligence Revolutionized the 2024 Paris Olympics

Posted on by Anna Bennett

At the end of July, many people across the globe were preparing to tune into the two-week, 2024 Olympic Games in Paris, France. The Olympics were slated to feature several high-profile athletes—including Simone Biles (USA, artistic gymnastics), Eluid Kipchoge (Kenya, marathon) and Marta Vieira da Silva (Brazil, football). However, in the lead-up to the Games, the International Olympic Committee (IOC) focused on a secondary player: Artificial Intelligence (AI). The IOC laid out an ambitious AI agenda aimed to enhance athlete performance, ensure fairness and optimize operations. The 2024 Paris Olympics represent a significant leap forward in integrating AI into the world of sports.

“Together, we can unlock AI’s full potential to promote solidarity, further digitalization, improve sustainability and resilience, and reinforce the role of sport in society.” – Olympic AI Agenda

Here, we explore several applications of AI in the 2024 Paris Olympics.

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SLIM Chances: Upside-down, but not Out on the Lunar Surface

Posted on by Shannon Sindermann
The lunar surface

The moon has perpetually been a beacon of curiosity to humankind, always in the sky urging us to look up and beyond. In the mid-20th century, this fascination sparked a historic rivalry between the United States and the Soviet Union, known as the Space Race. This era was marked by extraordinary milestones: satellites orbiting Earth, humans venturing into space and the landmark event of a man setting foot on the moon – a moment etched in history with the phrase, “One small step for (a) man, one giant leap for mankind.” It was an era where the impossible became possible – though some still question if it was a monumental human achievement or an elaborately crafted façade.

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Blending Art and Science in a Costa Rica Physics Lab

Posted on by Promega
Sophia Speece engaged her passions for art and science during her internship in Costa Rica.
UW-Madison student Sophia Speece (left) spent the summer in Costa Rica for the “Artist in the Science Lab” internship hosted by alum Dr. Mariela Porras Chaverri (right)

My name is Sophia Speece. I am a junior at the University of Wisconsin-Madison studying Biomedical Engineering and Music Performance. As you can imagine, there is not a lot of overlap between these two passions of mine.

This past summer I was given the unique opportunity to combine these two areas. I applied and was accepted for the “Artist in the Science Lab” internship abroad in Costa Rica!

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