user: What is a 4x4?

assistant: A 4x4 is a type of vehicle with four wheel drive. It is also know as a SUV, a sports utility vehicle. They are typically higher off the ground than standard cars, with more room inside the cabin. 4x4s typically are heavier with poorer handling, but have the capacity to drive off-road and cope with poor weather conditions much better.

user: Are Grizzly bears and Brown bears the same?

assistant: Grizzly bears are actually a subspecies of brown bears (Ursus arctos horribilis). The difference is regional:  Bears found inland are referred to as "grizzlies", while bears found on the coast are known as brown bears.

user: When was the Sydney Opera House formally opened

assistant: The Sydney Opera House is a multi-venue performing arts centre in Sydney. Located on the foreshore of Sydney Harbour, it is widely regarded as one of the world's most famous and distinctive buildings and a masterpiece of 20th-century architecture.

Designed by Danish architect Jorn Utzon, but completed by an Australian architectural team headed by Peter Hall, the building was formally opened by Queen Elizabeth II on 20 October 1973 after a gestation beginning with Utzon's 1957 selection as winner of an international design competition. The Government of New South Wales, led by the premier, Joseph Cahill, authorised work to begin in 1958 with Utzon directing construction. The government's decision to build Utzon's design is often overshadowed by circumstances that followed, including cost and scheduling overruns as well as the architect's ultimate resignation.

The building and its surrounds occupy the whole of Bennelong Point on Sydney Harbour, between Sydney Cove and Farm Cove, adjacent to the Sydney central business district and the Royal Botanic Gardens, and near to the Sydney Harbour Bridge.