Watching the World Cup? Check out this cool video about how goal-line technology works and why it's so effective.
As we head into an exciting weekend of World Cup 2018 action, Friday’s games provided no shortage of controversy and quality.
Brazil left it late to beat a dogged Costa Rica 2-0, while Switzerland defeated Serbia 2-1 with a last-minute Xherdan Shaqiri goal.
Finally, with Nigeria beating Iceland 2-0, the potential for Argentina to make the round of 16 was reopened.
On Saturday, Group F action sees Germany face Sweden and Mexico entertain South Korea, while Belgium and Tunisia will also face off in Group G.