Dynamic compaction is a ground improvement technique used to strengthen loose or soft soils by increasing their density and bearing capacity while minimizing settlement. It involves repeatedly dropping a heavy weight, typically ranging from 10-30 short tons (9-27 metric tonnes), from a height of 33-131 feet (10-40 m) onto the ground using a crane. The high-energy impacts compact the soil by reducing voids and rearranging particles, making it suitable for supporting structures like buildings, roa

Across the world, countries are rearming at an alarming pace — at levels not seen since the Cold War. Fareed explained how this is forcing tough decisions on how to pay for it: | Fareed Zakaria