Add Yahoo as a preferred source to see more of our stories on Google. There are a handful of ultra-high-net-worth pursuits that sound tempting, but don’t really make sense. They’re typically wildly ...

Triton’s Project Hercules, a concept unveiled at the Monaco Yacht Show, promises to rewrite the rules of design for mini-subs. It can dive to 656 feet, but its speed is even more noteworthy. Hercules ...