Areporter once described a light-year as ""the time it takes light to reach us traveling at the speed of light."" how would you correct this statement?

A light-year is a unit of distance. It is the distance travelled by light in one year.

Explanation:

A light-year is a unit of distance. It is the distance travelled by the light in one year. The speed of the light is 3×10⁸ m/s.

Light year also indicates how far back in time you are looking at. For example, if we are looking at something 10 light-years away that means it took light 10 years to reach us. So, in essence we are looking at the light which is 10 years old. In a way we are looking in the past.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia