Over-the-counter pregnancy tests give potentially life-changing results with a pretty high rate of accuracy. But how do they work? Tien Nguyen explains how each test performs a scientifically rigorous, multi-stage experiment that goes...

[Free Registration/Login may be required to access all resource tools.] While a woman is pregnant, the developing baby may be called an embryo or a fetus. The embryo stage lasts until the end of the 8th week after fertilization. After...

Detailed facts and interesting information about the 1973 landmark Supreme Court decision in the case of Roe v. Wade which ruled that state governments could not regulate abortion during the first three months until the end of the first...

Sample images of Carnegie stages of human embryo throught the first trimester.