__52 bits__
    /           \
  1.00000...00000  * 2**53    Large power of two
+ 1.00000...00000  * 2**0     1
--------------------------
  1.00000...00000  * 2**53
+ 0.00000...000001 * 2**53    Normalized exponents
--------------------------
  1.00000...000001 * 2**53    But we have limited number of bits
--------------------------
  1.00000...00000  * 2**53    Original large power of two