In many cases readers do not need to know who or what did the action because the focus is on the object of the action or the action itself. The important thing is not that someone did something but that something was done.
| The ferroelectric properties of polyvinylidene fluoride were first reported in 1971. These properties were exploited to take giant strides in the field of data storage and retrieval. |
In this example, the focus is on a particular polymer and its properties. For the purposes of the text, the person who reported the properties is of no importance.