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Repeated annual influenza vaccination generally offers consistent year-on-year protection against influenza. [100] There is, however, suggestive evidence that repeated vaccinations may cause a reduction in vaccine effectiveness for certain influenza subtypes; this has no relevance to recommendations for yearly vaccinations but might influence ...
Linux is the leading operating system on servers (over 96.4% of the top one million web servers' operating systems are Linux), [48] leads other big iron systems such as mainframe computers, [clarification needed] [49] and is used on all of the world's 500 fastest supercomputers [h] (as of November 2017, having gradually displaced all competitors).
CERN, a research center in Switzerland, created the first website. [4] The Web was publicly announced with a post to the Usenet newsgroup alt.hypertext on August 6, 1991. [5] There is a snapshot of the site from November 1992 at The World Wide Web project. [4]
Sunlight on the surface of Earth is attenuated by Earth's atmosphere, so that less power arrives at the surface (closer to 1,000 W/m 2) in clear conditions when the Sun is near the zenith. [100] Sunlight at the top of Earth's atmosphere is composed (by total energy) of about 50% infrared light, 40% visible light, and 10% ultraviolet light. [ 101 ]