1) The concept of 3D printing, also known as additive manufacturing, was first introduced in the 1980s and has since revolutionized prototyping and small-scale production.

2) The novel "To Kill a Mockingbird" by Harper Lee has been translated into more than 40 languages and has sold over 40 million copies worldwide.

3) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.

4) Insurance fraud occurs when individuals or organizations deliberately deceive insurance companies to receive undeserved benefits.