A catechist teaches and helps others understand the Christian faith, especially within the Catholic Church. Learn the role, training, duties, and history.

A distributor cap routes high-voltage electricity to each spark plug in the correct firing order. Learn how it works, why it fails and when to replace it.

A funny car is a purpose-built drag racing machine with a hinged body, huge rear tyres and immense power. Learn how it works and why it has that name.

A diplexer combines or separates two frequency bands so they can share one cable. Learn how it differs from a splitter and where it is used.

A scout scope is a low-power rifle optic mounted forward of the action. Learn its purpose, benefits, limits and how it differs from a normal scope.