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.
Hamnet died at age 11 and a half. Judith married Thomas Quiney in 1616, and the couple had three sons: Shakespeare Quiney, who died in infancy, and Richard and Thomas, who both died in 1639 within a month of each other. Since neither of the boys married, there is no possibility of any legitimate descendants from Shakespeare's line.