Surfactant is a complex substance containing phospholipids and a number of apoproteins. This essential fluid is produced by the Type II alveolar cells, and lines the alveoli and smallest bronchioles.
My friends and family say I am obsessive about the subject. Shakespeare had three children. Susannah was born in May 1583, six months after William married Anne (so Anne was pregnant at the time of the wedding). Two years later (1585) the twins Judith and Hamnet (girl and boy) arrived.
Indeed, the seven-year period between 1585 (when his twin children were born) and 1592 (when Robert Greene called him an upstart crow) is known as Shakespeare's lost years because no evidence has survived to show exactly where he was or why he left Stratford for London.