Human Life Begins at Conception: One Single Cell Becomes Trillions

When the cell was first discovered (and named) by Robert Hooke in 1665, it was hailed as a major discovery. However it was initially thought to be just a cell wall containing a mass of some sort of undifferentiated protoplasm.

It took years for scientists to learn just how complex that “simple cell” really was.

Gradually, they realized that even the standard animal cell contained many different highly specialized organelles–structures that perform various jobs inside cells. For example...