- Barack Hussein Obama II (born August 4, 1961) is an American politician who served as the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American to serve as president. Obama represented Illinois in the United States Senate from 2005 to 2008 and served as an Illinois state senator from 1997 to 2004.
- How the Square Root of 2 Became a Number (quantamagazine.org)
The ancient Greeks wanted to believe that the universe could be described in its entirety using only whole numbers and the ratios between them — fractions, or what we now call rational numbers. But this aspiration was undermined when they considered a square with sides of length 1, only to find that the length of its diagonal couldn’t possibly be written as a fraction.
