A 2025 satellite photo captures the stark contrast between the barren Poás volcano and the surrounding Costa Rican jungle.

Because the region is remote, rugged and spans two countries, satellite imagery plays a vital role in monitoring its volcanic activity.

Fast becoming mainstays of gamers and creative pros, 4K monitors are falling in price—but getting more complicated to buy. Here's how to shop for an ultra-high-definition (UHD) display, plus the top ...