1) A single bolt of lightning can heat the surrounding air to temperatures five times hotter than the surface of the sun.

2) The invention of the printing press by Johannes Gutenberg in the 15th century revolutionized the spread of knowledge and played a key role in the Renaissance.

3) The first modern health insurance policy was introduced in Germany in the late 19th century.

4) The development of the World Wide Web Consortium (W3C) and web standards has ensured interoperability and compatibility across different web browsers and devices.