1) A group of flamingos is called a "flamboyance."

2) The Sydney Opera House, situated in Sydney, Australia, is an iconic architectural masterpiece and a UNESCO World Heritage site. Its unique design, resembling sailboats or shells, has made it one of the most recognized and photographed landmarks in the world.

3) The smallest unit of time is known as a zeptosecond, which is equal to one trillionth of one billionth of a second.

4) The first graphical web browser, Mosaic, was released in 1993 and played a key role in popularizing the World Wide Web.