Endometriosis is a condition that causes endometrial tissue to grow outside of the uterus. This tissue can be found in patches on the surface of the ovaries, bladder, colon and abdomen.
Close but a little off. You can round it to 17 shots in a fifth. A standard shot is indeed 1.5 ounces, and a fifth is 750 millileters. There are 44.36 mL in each 1.5 oz shot. doing the math, there are 16.907 1.5oz shots in a fifth. It depends on the definitions. A fifth of a gallon is 25.6 oz, 725.76 mL.
Though Britain could use the equivalent to the USCS jigger (1.56126 fluid ounces, Imperial), I understand they use the metric amount. 1.5 fl oz (USCS) = 44.3603 ml, so a metric shot is 13% larger than a US shot. There are other size shots. A smaller metric shot is a half shot, 25 ml.