Sopho shrugged. "In a certain per cent of cases, where radiation
is extreme but not fatal--naturally, the reproductive capacity
will display unpredictable, permanent damage. Recessive damage.
When, however, two persons mate who exhibit matching gene
deterioriation--then--as this man says--"
The colonel's hand dropped. "I didn't know," he murmured. "Not
certainly. I didn't even know that you men were sure."
Learned spoke. "War against the generations! Good--!" He checked
himself.