Stamp of the Day: Viking waves

Waves and water have been around on Earth much longer than most other things, except rock and minerals. It is just the last few thousand years, the seas have seen strange things such as boats floating on top of them. The same waves that crashed over marine dinosaurs are now crashing over piers and oil drilling platforms. Some things change, some do not. Stamp of the day is in memoriam of the Danish-American sea connections since Viking times.