Google acquired reCAPTCHA on September 16, 2009. Luis von Ahn, reCAPTCHA founder and a research scientist at Google explains how it works.
Inside Search- Introducing the Knowledge Graph: things, not strings
- The Knowledge Graph for mobile and tablet search
- Test your search skills with A Google a Day now on Google+
- Search quality highlights: 52 changes for April
- Helping students become savvy searchers with our new Search Education hub
- Another step to reward high-quality sites
- Search quality highlights: 50 changes for March
- Graphing on Google.com - Now in 3D
- Learning independence with Google Search features
- Find flights to destinations worldwide
