Cram101.com - useful for common sense knowledge bases?

Cram101.com offers summaries of books, the stuff you would highlight, for a monthly fee.

I imagine this could be an efficient way of organizing (constructing) one's knowledge of the domain, i.e. learning, if only because these sentences lack context (the only "context" is in the terms used). This probably also means that you can't deep knowledge... it seems depth forces vagueness.

In normal books, it's easy to get lost if you're not patient and want to skip around. Impatience is one of my worst vices, only partially compensated by my persistence and refusal to accept defeat on things that should be doable.

For the same reason (context-freeness), this kind of text could be useful common sense knowledge bases, as well as for for Question Answering in Information Retrieval. As you can see, these definitions look a lot like WordNet glosses.

Here's one of their samples:

Basic Concepts in Biology
Starr, 5th Edition, Brooks/Cole

Concepts and Methods in Biology (see text page 2)
1. The scientific study of life is biology.

2. The main site of photosynthesis in a plant; consists of a flattened blade and a stalk that joins the leaf to the stem.

3. Natural refers to occurring or produced as a normal part of nature apart from any activity or intervention of humans. Opposite of artificial, synthetic, human-made, or caused by humans.

4. Sample that goes through all the steps of an experiment but lacks the factor or is not exposed to the factor being tested is a control.

5. Extra nucleotides added to the beginning of an RNA transcript in the nucleus of a eukaryotic cell is called cap.
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