Why can’t a girl unscrew the cap of a bottle but can unscrew the top of her boyfriend’s head?

【appendix】

1. When a factory produces bottled beverages, the torque value for locking and opening the product bottle caps is one of the key process parameters to be controlled. Generally speaking, the torque of bottled beverages can be opened by most people, but it is not ruled out that the same batch or different batches of products may not meet the standard, so some bottle caps of the same beverage may be difficult to open.

2. If you really see a girl who can't open a bottle cap, all male compatriots, you should still lend a hand! However, a male netizen said that some bottle caps are not only difficult for girls to open, but even for boys! !

【References】

[1] Shao Shuping, Min Yijian. Experimental study on the comparative muscle strength of boys and girls[C]. Editorial Department of Acoustic Technology, 2013:4.

[2] Wang Beihai. Ergonomics research of threaded bottle caps based on opening ability[D]. Hubei University of Technology, 2006.

[3] Huanqiu.com. (2015). Revealing the 8 major differences between men and women’s bodies that you don’t know.