Over the past 20 years, there’s been a revolution in the science of arson investigations. Many of the clues that had been used for decades to determine that a fire was not accidental have been proven to be false. Reporter Michael May looks closely at two deadly fires to explore the cutting edge of fire science.

What does it mean when a woman commits a crime and attributes her actions to PMS? We revisit the court case for — and the science behind — the first use of the “PMS defense” in this country, back in 1981. Featuring the true crime show, Criminal.

Step inside an archaic machine on the brink of extinction: the iron lung.

Math meets mime -- and the result is unforgettable.

Told by the couple who lived it, this is a story of how Crohn’s disease can change lives when you least expect it. And it’s a story of how science can present multiple paths to — hopefully — relief or recovery.

In music, everything seems to have another digital, electric life. Pianists can play with different voicings on an electric keyboard. Guitarists can filter their instrument’s signal through a pedal or amp to create various effects. Why shouldn’t violinists be able to digitally harness the sound of a Stradivarius? For starters, it takes an incredible feat of engineering to capture the authentic sound of a violin. David Schulman takes us to visit a top violinmaker who has been working with a physicist and two engineers to create a prototype digital violin.

A scientific mentor can make or break your career. Dr. Wendy Suzuki introduces us to Dr. Marian Diamond, whose lively classes ushered Wendy into a career in neuroscience. And Wendy shares how she came to study how exercise profoundly affects the brain, not just the body.

One of the things we assign to science is that there are true, absolute facts. But scientists are human and, it turns out, as prone to blind spots in their thinking as the rest of us, especially when cultural assumptions and biases get in the way. Biologist Christina Agapakis explores ways these blind spots, especially around gender and sexism, have affected research and women’s careers in science. She talks with one of her heroes, anthropologist Emily Martin, and Emily's husband, biophysicist Richard Cone, about Emily's 1991 article "The Egg & The Sperm." She also talks with anthropologist Kate Clancy, who has spent a lot of time thinking and writing about the ways women’s careers in science are different from men’s.

When plant researcher David Rhoades found evidence that plants could communicate, it was a paradigm-shifting discovery. But it could not have come at a worse time.

What motivates young people to become scientists? Meet Maricruz Jaramillo and Samoa Asigau, two young women scientists from opposite sides of the Pacific Ocean, whose professional aspirations have taken them to the Galapagos Islands. Science reporter Véronique LaCapra joined Mari and Samoa in the Galapagos, where they are studying a type of malaria that is affecting native bird populations.