In the first half of the 18th century citizens of Königsberg were very proud of their city and the seven bridges located in it. It is said that city had great views near the river, so the citizens liked to take walks by the river. While on a walk they, obviously, had to traverse the bridges. Naturally the question emerged - would it be possible to choose path so that it would allow to traverse each bridge only once. The answer and the analysis of the problem maybe found in this video by Numberphile.

Evil syndicate has built a 10 floor pyramid. This pyramid has a lot of empty rooms, while there is one control room, which hosts control machine for the super weapon, which you must destroy. The problem is that you do not exactly know on which floor the control room is. You only have a couple cryptic clues...

Mike Rugnetta and the team behind the PBS Idea Channel each week tackle an interesting idea or question related to the contemporary life. We share their video in which they tackle a question intimately related to the themes covered in Physics of Risk blog - how to control social systems (see related post).

See this SciShow video about why we prefer "pink" noise over "brown" noise. It appears that listening to "pink" noise might also help us concentrate.

Parliament elections are coming to Lithuania and thus we invite our readers to check against being phished. We suggest a TEDx talk by Nobel prize laureate Robert Shiller as a source for mental exercise. In this talk he present the main ideas behind his latest book "Phishing for phools".