Gertrude is a scientific incompetent from 50 years ago. Johnson stole his arguments from Duane Gish, trimming all the obviously YEC stuff. OK, he claims that he's "not a creationist." (Nyuk! Nyuk! Nyuk!) His resume says that he's not a scientist, either.
If what they say is so obviously wrong (according to you), how come you cannot refute the message and instead lower yourself to attacking the messengers??????