1) The Great Barrier Reef in Australia is the largest coral reef system in the world and is visible from space.

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

3) The strongest natural material known to man is spider silk. It is stronger than steel and more flexible than nylon.

4) The development of voice recognition technology has led to the widespread use of virtual assistants such as Siri, Alexa, and Google Assistant.