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

2) The Industrial Revolution, which began in the 18th century, brought about significant changes in agriculture, manufacturing, mining, and transportation.

3) Orchids are one of the largest families of flowering plants, with over 25,000 species.

4) The Eiffel Tower can be 15 cm taller during the summer due to thermal expansion.