The second world war was arguably the most catastrophic war in human history. The origins of the second world war in Europe are complex and controversial. The following article is a list of ten books that provide different perspectives on the root causes of the second world.
{{Read more|Causes of World War II Top Ten Booklist}}
</div>
<div class="portal">
[[File:Britishmuseumassyrianrelieftwohorsemennimrud.jpg|left|thumb|125px]]
==[[How has the Role of Horses Changed in Human Societies?]]==
The horse today is often seen as an animal useful for recreation, sport, transport, and work. The nature of the horse, however, has changed in different societies across time. Sometimes horses were seen as war animals, while in other places and periods there use was the privy of royalty.
{{Read more|How has the Role of Horses Changed in Human Societies?}}
</div>
</div>
<div class="portal">
[[File:The_Straight_State.jpg||left|thumb|100px]]
==[[History of Sex (American Version) Top Ten Booklist]]==
These are our Top Ten History of Sex books (American Version). As per usual, we included some caveats and and explanations for our selections.
First, this is a history of sex / history of sexuality list. We understand that there is a distinction but, for us, these two things blur together.
{{Read more|History of Sex (American Version) Top Ten Booklist}}
</div>
<div class="portal">
