Anchor: A man is giving a presentation in front of a lot of people.
Entailed: a man gives presentation
Contradiction: the man is silent
Contradiction: the blue-checked shirt sitting on bench
Contradiction: The 50 m (164 ft) torrent of water falls over three large breaks, forming two substantial pools and a smaller cave system.
Contradiction: Go on about snow. 
Contradiction: The article talked about decomposition periods of something.