iridium

Below is a list of the most expensive materials in the world, please consult.

Gold and diamonds are commonly known as rare and expensive metals in the world. But few know that there are other rare and more expensive metals because of their special use.

Metals and gemstones are beyond value and common uses can also be used for many other unexpected purposes.

The question is very silly, but this is the main topic discussed by scientists at the Royal Scientific Conference held in London.

A series of comets may be the source of Earth's oceans about 3.85 billion years ago, the new study says.