His father's career as a university professor influenced Friedrich's goals later in life. Both of his grandfathers, who lived long enough for Friedrich to know them, were scholars. Franz von Juraschek was a leading economist in Austria-Hungary and a close friend of Eugen Böhm von Bawerk, one of the founders of the Austrian School of Economics. Von Juraschek was a statistician and was later employed by the Austrian government. Friedrich's paternal grandfather, Gustav Edler von Hayek, taught natural sciences at the Imperial Realobergymnasium (secondary school) in Vienna. He wrote systematic works in biology, some of which are relatively well known.
What did August von Hayek's father write?
systematic works in biology

Another solution to the problem of causality-based temporal paradoxes is that such paradoxes cannot arise simply because they have not arisen. As illustrated in numerous works of fiction, free will either ceases to exist in the past or the outcomes of such decisions are predetermined. As such, it would not be possible to enact the grandfather paradox because it is a historical fact that your grandfather was not killed before his child (your parent) was conceived. This view doesn't simply hold that history is an unchangeable constant, but that any change made by a hypothetical future time traveler would already have happened in his or her past, resulting in the reality that the traveler moves from. More elaboration on this view can be found in the Novikov self-consistency principle.
What is another solution to the problem of temporal paradoxes?
paradoxes cannot arise simply because they have not arisen

Infectious diseases are sometimes called contagious disease when they are easily transmitted by contact with an ill person or their secretions (e.g., influenza). Thus, a contagious disease is a subset of infectious disease that is especially infective or easily transmitted. Other types of infectious/transmissible/communicable diseases with more specialized routes of infection, such as vector transmission or sexual transmission, are usually not regarded as "contagious", and often do not require medical isolation (sometimes loosely called quarantine) of victims. However, this specialized connotation of the word "contagious" and "contagious disease" (easy transmissibility) is not always respected in popular use.
When are infectious diseases called contagious diseases?
when they are easily transmitted by contact with an ill person