Okay kiddo, do you know how some things are see-through and some things aren't? The things you can see through are called transparent, and the things you can't see through are called opaque. Well, scientists have made a special type of material that can do something amazing with light that we can't see with our eyes, called terahertz waves!
You see, there are waves of energy that exist all around us, even though we can't see them. One type of these waves is called terahertz waves, which have very high frequencies and short wavelengths. Scientists now have materials called terahertz metamaterials which can interact with these waves in interesting ways.
These materials are made up of tiny, unique structures that are too small for us to see. When terahertz waves hit these structures, they can cause the waves to do different things that we can control. We can make these materials bend, twist or shape these terahertz waves any way we want–that's what makes these special materials so neat!
Scientists use terahertz metamaterials to do lots of cool things like making things invisible, detecting dangerous substances, and making faster electronics. So, terahertz metamaterials are like special materials that play with waves we can't see, so scientists can make awesome things that help us understand and do cool things in our world.