Can you summarize this topic?

In binary notation, in the first column on the right (the "one" column), 0 means zero 1's, and 1 means one 1. In the next column to the left (the "two" column), 0 means zero 2's and 1 means one 2. In the next column (the "four" column), 0 means zero 4's, and 1 means one 4. The same pattern follows in each column. Moving to the left, the columns are "sixteen," "thirty-two," "sixty-four," and so on, each column being worth twice as much as the column to its right. For example, take the base-ten number 61: 61 consists of one 32 plus one 16 plus one 8 plus one 4 plus zero 2's plus one 1. So 61 is notated in binary as 111101 (pronounced "one one one one zero one").