Mysteries of Summer, Explained by Duke Experts

A collage of summer things: a sun, a book, sunglasses, a mosquito
Illustration by Jess Abel

The following is a summary of a story by Cara August on Trinity College of Arts & Sciences.  

Summer means sunshine, vacations and warm evenings outdoors, but it also brings risks: wildfires, stronger UV rays, booming mosquito populations and disrupted routines. Four Duke experts explain the science behind the season. 

What’s Fueling Wildfires 

Three factors are driving today’s larger, more severe wildfires, says Duke biologist Jacob Levine. Climate change is creating more hot, dry and windy days that help fires spread quickly. Decades of fire suppression and the prevention of Indigenous burning practices have allowed vegetation to build up, creating more fuel, while forest thinning and prescribed burns have not kept pace. 

Extreme fire weather is becoming more common, Levine said, making fires burn faster and more intensely. 

Why The Sun Feels So Much Stronger 

Scientists measure UV light — and the rest of sunlight’s spectrum — by using prisms to separate light into its component wavelengths, like a rainbow. 

The summer sun is more intense because its rays pass through less of Earth’s atmosphere, says physicist Martin Fischer. Less atmosphere means less ultraviolet light is absorbed or scattered, allowing more UV to reach the ground and increasing the risk of skin damage. 

Why Mosquitoes Take Over  

Warm weather helps mosquito populations grow rapidly, according to entomologist Ke Dong. Scientists track mosquitoes by inspecting standing water for larvae and using specialized traps to catch adults and test them for disease. 

“Summer provides mosquitoes with ideal conditions,” Dong said. Higher temperatures speed their growth, shorten their life cycle and allow females to lay eggs more often. 

Why Goals Often Fall Apart 

Summer’s relaxed schedule can make it harder to stay motivated, says psychologist James Shah. Without regular routines, people lose the structure that helps keep goals on track. 

“The solution, ultimately, is not to summon more motivation but to design better conditions for action,” Shah said. He recommends building small daily habits, setting deadlines and creating accountability. 

To read the full story, go to Trinity College of Arts & Sciences.