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By: Kristin Kelley | Published: Sep 02, 2010

The extraembryonic membranes that surround and originate from the embryos of vertebrates such as birds, reptiles, and mammals are crucial to their…

By: Kristin Kelley | Published: Oct 29, 2010

In 1881 British opthalmologist Warren Tay made an unusual observation. He reported a cherry-red spot on the retina of a one-year-old patient, a…

By: Kristin Kelley | Published: Sep 02, 2010

Throughout history methods involving urine have been a popular way to test for pregnancy. Early ideas ranged from simply observing the color of a…