Those small markers are "Stolpersteine" (stumbling blocks) a project which started in Cologne. Now, more than 40,000 of them can be found all over Germany and 17 other countries. There is a film about the project.http://en.wikipedia.org/wiki/StolpersteineMore up to date in German: http://de.wikipedia.org/wiki/Stolpersteine#Timeline_of_quantities Abusive comment hidden. (Show it anyway.)
I'm confused. Solar powered mowers have been around since the 90s... Abusive comment hidden. (Show it anyway.)
http://en.wikipedia.org/wiki/Stolpersteine
More up to date in German: http://de.wikipedia.org/wiki/Stolpersteine#Timeline_of_quantities