Main Page | See live article | Alphabetical index Oskar Klein (September 15 1894 - February 5 1977) was a Swedish theoretical physicist. He is credited for inventing the idea that extra dimensions may be physically real but curled up and a very small. He was a professor at the Stockholm University between 1931 and 1962. This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.