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.
The average man proposes after three years - and the average woman wants him to pop the question four months earlier. Whirlwind romances may not be to everyone's taste, but it seems boyfriends who are approaching their third anniversary are overdue for the ultimate romantic gesture. The average couple gets engaged two years, 11 months and eight days after first setting eyes on each other, according to research. But women feel ready to tie the knot even sooner - after just two years, seven months and 24 days.