• The old index had several layers
• some of which layers refreshed at a faster rate than others
• The main layer would update every couple of weeks
• To refresh a layer of the old index, the entire web has to be analyzed
• So there was a significant delay between when a page found and made it available to users. 
• Caffeine provides 50 percent fresher results for web searches than old index
• In Caffeine, the web is analyzed in small portions and update the search index on a continuous basis, globally.
• When ever a new page is find, or new information on existing pages, It can be added straight to the index
• It means users can find fresher information than ever before.
• Caffeine takes up nearly 100 million gigabytes of storage in one database
• It adds new information at a rate of hundreds of thousands of gigabytes per day
• It would need 625,000 of the largest i-pods to store that much information
• If these were stacked end-to-end they would go for more than 40 miles in old index

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