With 3D ultrasound a volume of echoes is taken which can be stored digitally and shaded to produce life like pictures of the fetus. 4D just means that these life like pictures can be seen to move in real time so the activity of the baby inside your womb can be studied.
A short recording of Rosslyn Chapel in Scotland, famous from the book The DaVinci Code by Dan Brown. Voice in the background is a keen American who was VERY knowledgeable about the various conspiracies.
![Dominick\](http://img.youtube.com/vi/H_bKE--m4i8/2.jpg "Dominick\")
![Dominick\](http://img.youtube.com/vi/BWiyH0sPxCI/2.jpg "Dominick\")
