Question

Karen does not believe in electromagnetic fields because she can't see them Even though electromagnetic fields are invisible why should Karen still be able to scientifically determine that they exist?
Karen's physics teacher believes in electromagnetic fields, so Karen should as well.

Some scientific facts, like electromagnetic fields, cannot be measured or explained using the senses.

Electromagnetic fields don't physically exist. They're just a tool for explaining something completely mysterious.

Electromagnetic fields influence other objects in ways that are visible or measurable