Each pleural cavity is lined by a pleural membrane that is composed of two layers. The visceral pleura surrounds the outside of the lung. The parietal pleura lines the inside of the chest wall and extends over the diaphragm.
Again, it's an average, but the average date costs just less than $45. This is across the board, though; predictably, when broken down by gender, men spent a lot more than women per date. Women spent an average of about $34.29 per date, while men spent an average of about $65.69, they reported. There were also the penny-pinchers â about 20 percent said they spent an average of zero dollars per date, and a whopping 19 people, or almost 2 percent, said they spent more than $500 per date before marriage.
Of that, around $1.1 billion is from online dating, $576 million is from mobile apps such as Grindr and Tinder, and the rest is made up mainly of matchmakers and singles events. So perhaps it should come as no surprise that as the popularity of online dating has risen, so have prices. A decade ago, many sites were free or had minimal fees of around $20 a month.