It turns out this thing's called an "Inogon leading mark" or "Inogon light" -- Inogon, not Inogen -- and it's a Swedish invention from the 1980s. But there's still a question: why is being used to mark an undersea cable, instead of guiding people home?
Anyone can learn to be a productive worker. This video discusses 2 ways to do this: working smarter and working harder. Productivity is a key ingredient to earning more money, and a key ingredient to feeling satisfaction with your work.
