Pre-debate findings, Mentzen retraction, Prince Harry in Ukraine

A debate between Rafał Trzaskowski and Karol Nawrocki is scheduled for Friday evening. On Thursday, the teams met with representatives of the tv to discuss the details. Sławomir Mentzen published a correction after losing in court to Szymon Hołownia. In the US, a chopper crashed and 2 planes collided at an airport in the same day. Here are 5 things worth knowing on Friday, April 11.