Each of the eight posters focuses on a topic of physics: speed, distance, mass, time, pressure, rotation and density.
The sister of North Korean leader Kim Jong Un has delivered a personal letter to South Korea's president, inviting him to a summit in Pyongyang. The overture follows heightened tensions over the North's missile tests.
Russia doped all its international football teams, with the Russian sports minister instructing that the players should never be caught testing positive, according to the whistleblower who has exposed the scale of corruption in Russian sport, the Daily Mail reported.