What is things not seen by andrew clements?

As an AI language model, I do not have access to Andrew Clements' personal experiences or thoughts, so I cannot provide specific information regarding things not seen by him such as his personal blind spots or unknown phenomena. However, I can provide general information about invisible things or concepts that are typically not seen by human eyes, such as:

1. Ultraviolet and infrared light: There are many wavelengths of light beyond what humans can see with the naked eye, such as ultraviolet and infrared light that require special equipment to detect.

2. Gravity: Gravity is an invisible force that is present in every object, including the earth, the moon, and the sun.

3. Electromagnetic fields: All objects that have electric charges produce electromagnetic fields that can affect and be felt by other objects that interact with them.

4. Radio waves: Radio waves are a form of electromagnetic radiation that are responsible for transmitting information between devices such as radios, TVs, and cell phones.

5. Thoughts and emotions: Thoughts and emotions are invisible concepts that exist within the mind and cannot be physically seen or touched.

6. Microorganisms and viruses: Microscopic organisms such as bacteria and viruses are too small to be seen by the naked eye but can have significant impacts on human health and the environment.

7. The future: The future is an abstract concept that has not yet occurred and is therefore invisible and impossible to predict with full certainty.