Optical illusions

Which direction are the black and white balls moving?

On National Geographic there is right now a science show called Brain Games. Even though a lot of the contents is not new, there was one optical illusion which really fascinated me: Look at the full image, look at the red circle, look at the yellow circle… (image found at Mighty Optical Illusions)

City of Stralsund flogs unique library collection

Money has to be saved everywhere these days, but should a public entity be allowed to flog the family silver? The city of Stralsund, UNESCO world heritage site, has recently silently and covertly sold off a unique library collection. An online petition was started with the aim to revoke this action: https://www.openpetition.de/petition/online/rettet-die-stralsunder-archivbibliothek