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Thursday is officially Pi Day, offering Americans the annual opportunity to geek out over math, geometry and all things STEM. (It’s also recently become #DressForSTEM Day, celebrating women in science — more on that below)

In honor of 3.14, we recently canvassed the country, searching out STEM students with noteworthy projects and inventions. You can see all our recent profiles on our STEM Superstars microsite; here are our most recent video profiles of four remarkable teenagers:

Helping Amputees — Virginia’s Arav Bhargava

The 18-year-old senior at The Potomac School in McLean, Virginia has developed a universal fit, 3D-printed prosthetic for amputees missing their forearms. (Read the full story)

Confronting Depression & Suicide — New York’s Natasha Kulviwat

The 17-year-old from Jericho researched a biomarker to help identify those at risk of suicide. (Read the full story)

Easing Anxiety — Philadelphia’s Gavriela Beatrice Kalish-Schur

The 18-year-old senior at Pennsylvania’s Julia R. Masterman High School gave fruit flies anxiety to gain a deeper understanding for what makes us anxious — and to pave the path for better treatments. (Read the full story)

Improving Rural Health Care — Maryland’s William Gao

The 18-year-old from Ellicott City’s Centennial High School created an AI-enabled diagnostic app that could help save rural cancer patients. (Read the full story)

And in honor of March 14 and Women’s History Month, The 74’s Trinity Alicia explores women’s ongoing impact in STEM and how a hashtag is driving the Pi Day conversation to representation of women in the field: