The proof, known to be so hard that a mathematician once offered 10 martinis to whoever could figure it out, uses number ...

To­day, No­vem­ber 1, is the Solem­ni­ty of All Saints; a day when we ho­n­our all saints, known and un­known. In his Gen­er­al Au­di­ence in 2014, Pope Fran­cis said: “... all Chris­tians, in­so­far ...