Please explain the cause of anomalous expansion of water

Here you go: Let me google that for you (http://lmgtfy.com/?q=anomalous+expansion+of+water)

Please refer to this announcement: https://www.askmehelpdesk.com/finance-accounting/announcement-font-color-ff0000-u-b-read-first-expectations-homework-help-board-b-u-font.html

Anomalous properties of water (http://www.lsbu.ac.uk/water/anmlies.html) is one of my favorite web pages, does that make me a geek? :3