The tourists stopped to spread picnic blankets at a scenic point overlooking the picturesque lake of Lough Tay in Ireland’s Wicklow Mountains. But the four scientists trekked on, climbing toward the ...

Jared Wildenradt is likely the most prolific hiker of the Ice Age National Scenic Trail ever, and he doesn't plan to stop anytime soon. Lisa Siewert teaches geology and geography at the University of ...