Feanor

As she came back from her vacations on the sea, Martina became sick.
It seems she has got this disease:
http://en.wikipedia.org/wiki/Roseola
Since I do not have any little child around, I did not know about these two viruses.
I've read something about the whole Herpes family:
http://en.wikipedia.org/wiki/Herpesviridae
And it is very interesting.

Besides the incredible complexity of life at the cellular level, also this is very interesting:
http://en.wikipedia.org/wiki/Endogenous_retrovirus
"It is believed that the ancestors of modern viviparous mammals evolved after an infection by this virus, enabling the fetus to survive the immune system of the mother."
And:
"There are many thousands of endogenous retroviruses within human DNA (HERVs comprise nearly 8% of the human genome, with 98,000 elements and fragments)."
So it seems all this genetic manipulation made by wave after wave of viruses plays a big role in evolution.