xxviii

ps
twenty eight.....
~ there are 28 days in february unless it is a leap year.
~ is the third granville number.
~ is the ninth and last number in early indian magic square of order 3.
~ atomic mass of silicon.
~ atomic number of nickel.
~ fourth magic number in physics.
~ revolution time of the surface of the sun on itself is 28 days while its core is revolving in 33 days.
~ an abbreviation for such years as 1928 and 2028.
~ number of dominoes in standard domino sets.
~ postal code of the province of madrid, in spain.