What happened when we recreated football scenarios in a laboratory.
This is the first time Video Assistant Referee system, known as VAR,has been used at the world cup to assist referees make decisions.
KIMIMASA MAYAMA/AAP
Video assistant referees have led to some controversial decisions at the World Cup. Rather than improving the quality of decision making by on-field refs, VAR could undermine it instead.
At the 2014 World Cup African fans felt that Nigeria were on the receiving end of poor refereeing.
Peter Powell/EPA