Fire Play..

Do it fast

 
  Usually people wet their feet before walking on burnt coal. When they started walking on the coal, this moisture evaporates and forms a protective gaseous layer beneath the feet. In reality they will be walking on the water vapour layer rather on the burning coal, This is a short time effect and one should walk quickly to avoid damage. Further, coal donot conduct heat as quick as other metals. Moreover, skin of human feet is a bit coarse and has the capacity to resist heat for some time...

A little review on facebook...

Ohhh..

Facebook serves 570 billion page views per month (according to Google Ad Planner). There are more photos on Facebook than all other photo sites combined (including sites like Flickr). More than 3 billion photos are uploaded every month. Facebook’s systems serve 1.2 million photos per second. This doesn’t include the images served by Facebook’s CDN. More than 25 billion pieces of content (status updates, comments, etc) are shared every month. It has more than 30,000 servers (and this number is from last year!) and still uses PHP, but it has built a compiler for it so it can be turned into native code on its web servers, thus boosting performance. Facebook uses Linux, but has optimized it for its own purposes (especially in terms of network throughput). Facebook uses MySQL, but primarily as a key-value persistent storage, moving joins and logic onto the web servers since optimizations are easier to perform there (on the “other side” of the Memcached layer). Then there are the custom-written systems, like Haystack, a highly scalable object store used to serve Facebook’s immense amount of photos, or Scribe, a logging system that can operate at the scale of Facebook (which is far from trivial). But enough of that. Let’s present (some of) the software that Facebook uses to provide us all with the world’s largest social network site.