This double-helix model of DNA is iconic, but not what you would see if you looked in your cells right now. BSIP/Universal Images Group via Getty hide caption
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anatomy lesson
Can you guess which eyes belong to what animal? Top row, from left: cuttlefish, lion, goat. Bottom row, from left: domestic cat, horse, gecko. Top row: iStockphoto; bottom row: Flickr hide caption
Eye Shapes Of The Animal World Hint At Differences In Our Lifestyles
Rembrant's The Anatomy Lesson of Dr. Nicolaes Tulp. Fine Art Images/Heritage Images/Getty Images hide caption