What are the top 10 controversial topics about which people (you feel close to) frequently debate about?

”‘Israel’ and ‘God’ along with ‘Hitler’ and ‘Holocaust’, are among the most contested and controversial topics on Wikipedia, a new study has found.

Researchers collate info across languages to see which articles get the most edits. The lead author, Taha Yasseri, also wrote a bit on his blog:

We believe that this kind of case-studies (Wikipedia being the case) could help us and social scientist to understand more about human societies. Topics like conflict emergence, its dynamics, its universal features, and the resolution mechanisms could be empirically examined for the first time. Most of the theories in social science could have never been tested against real world experiments (in contrast to natural sciences). But now, thanks to our digital life of today, we are able to track and analyze all the actions and interactions of a huge society of individuals (here, Wikipedia editors), so why not test the pre-existing social theories in a large ‘social experiment’ of Wikipedia?”

http://www.wired.com/wiredscience/2013/05/the-controversial-topics-of-wikipedia/

http://www.timesofisrael.com/wikipedians-most-likely-to-war-over-israel-god/

http://comminfo.rutgers.edu/~aspoerri/searchCrystal/searchCrystal_editWars_ALL.html

What are your personal most controversial topics?

What do you think about the notion of resolution mechanisms that could be empirically examined? Will this lead to a more peaceful world?