An egg shell may have as many as 17,000 tiny pores over its surface.
The average laying hen lays 257 eggs a year.
A hen needs just 24 to 26 hours to produce an egg. Thirty minutes later, she starts all over again.
Sometimes a hen will lay a double-yolked egg. It is rare, but not unusual, for a young hen to produce an egg with no yolk at all.