Brain Demo - This is a huge Newton book (718 pages) demo, which lets you see all of the topics that are included in the real version, but only a fraction of the information. This is enough to illustrate the linking technology, and hopefully enough to entice one to pay for the full version. Click on a topic to view information, there is a links out and in area where you can tap and instantly be taken to a different topic. For example, click on Acupuncture and read a full page of text. Then scroll down to the links in, which is medicine, and scroll again to links out, which includes brain, disease, human, medicine, pain, physiology, shock, spinal chord and surgery. Takes up 1,629 k on the card.