Geraldine has over a decade of experience writing within the home improvement sector. Additionally, she has unique first-hand renovation experience as the previous owner of a house-flipping business.

For centuries, geologists have recognized that the rocks that line riverbeds tend to be smaller and rounder further downstream. But these experts have not agreed on the reason these patterns exist.

MANAUS, Brazil, Oct 23 (Reuters) - Human faces sculpted into stone up to 2,000 years ago have appeared on a rocky outcropping along the Amazon River since water levels dropped to record lows in the ...