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Archive.org is a great website full of book rarities available for free download. The only problem is that most of their PDF files are quiet unreadable, not just on a tablet, but even on a stronger desktop PC, because they are optimized for minimal size, and it can take around 5-10 seconds for a tablet to render a page. This post shows a method for converting those PDF files to larger files (around 4x), which can be comfortably browsed offline even on a tablet.
This picture of the Moon is made from the average (mean) of 16 RAW images (14 bit), taken on the 30th of May 2012, around 23:30 (UTC+1), at Frankfurt am Main. I used my 9.25 inch Celestron telescope, with an adapter, which reduces its focal length, so the whole Moon fits in the screen, and also produces higher brightness level. The settings for the DSLR camera are: ISO: 100, Shutter speed: 1/400.
Final position of the one and only Botvinnik – Fischer game (1962). Click on the image to enlarge. Analyzed the position with the 64 bit Rybka 3, and even after the depth of 39 moves it still can’t see that this is a draw. I wonder how many moves would reveal this draw for a chess program. It is really hard to estimate. The program tries every variation without repeating a position 3 times – because that means draw by the laws – and without any exchange, because that would also lead to draw in this situation, if white keeps