"Knee-high by the Fourth of July" is an old favorite saying, when you'd drive past a field of corn out in the country. And many of the old favorite varieties, called heirloom corn, have lots of new friends.

In recent years, seed companies have been reporting big sales numbers for these varieties. Baker Creek Heirloom Seeds in Missouri says sales are "skyrocketing" — a fitting verb for the fireworks holiday.

A new agricultural plant near Othello in Eastern Washington is breeding highly specialized corn for the huge world-wide seed company Monsanto. The laboratories and growing facilities are slated to help the company more quickly distil the genetics of corn to get top characteristics to market.

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Two  corn cobs walk into a bar.  They notice a third, shady-looking cob trailing them. First cob turns to his friend and whispers ...