Photo credits:

1.Tattoo: http://www.flickr.com/photos/juliemelton/819215573/ 2.Arm wrestling: http://www.flickr.com/photos/juliemelton/819215573/3.Fish: Tracy Van Slyke; used with permission.4.Groucho: http://www.flickr.com/photos/jstar/3268598372/5.DNA: http://www.flickr.com/photos/13338351@N07/2243853949/6.Empathy: http://www.flickr.com/photos/auro/106509125/7.Crowd: http://www.flickr.com/photos/gaspi/79805619/sizes/o/8.Legos: http://www.flickr.com/photos/oblongpictures/4473653134/9.Two women, iStockphoto: http://www.istockphoto.com/stock-photo-7903506-two-women-in-a-window.php