Marine second-lieutenant Patrick Callahan serves in the University of Michigan’s Naval ROTC program. Michigan Today asked Lt. Callahan to describe the impact of the 9/11 attacks on his military experience.

When alumnus Bill Sparrow decided to kayak the entire length of the Mississippi River, he and his wife Laura expected adventure. But they didn’t expect a whole new understanding of their country, its grandeur and its people.

From John F. Kennedy to Barack Obama, presidents have challenged University of Michigan students to change the world.

Plus: Kids these days: How involved is this generation?

Last month, we told you about the U-M Human Trafficking Clinic, which works to protect the victims of modern-day slavery. Now the clinic, with help from the US State Dept., is opening a new clinic in Mexico. There, law students from U-M and Mexico will work to stop human trafficking from across the border.

Video: U-M law prof Bridgette Carr is fighting against the world’s second – biggest criminal enterprise.

Even the youngest Holocaust survivors, like Dr. Emanuel Tanay, are reaching their 80s. What does it mean to have lived, and to remain a witness to one of history’s great atrocities?

U-M professor Ricky Rood, an expert in world and regional climate issues, calls Pakistan’s catastrophic flooding “a case study of climate disaster.”

She won a Pulitzer Prize for uncovering tragic events at a New Orleans hospital following Hurricane Katrina, but that was just one small part of a remarkable career.

Cdr. William Mayes is helping rebuild Iraq’s electrical infrastructure.