Nepalese Crown Prince Dipendra killed his father, King Birendra, and eight other royal family members on June 1, 2001 in an event which would come to be known as the Nepalese Royal Massacre. Dipendra then shot himself in the head and died three days later. The crown prince's motives are still shrouded in mystery, although speculation continues. Nepal would later become a republic on May 28, 2008. Learn more about the Nepalese Royal Massacre.

On June 1, 2000, the Patent Law Treaty (PLT) was signed in Geneva. The purpose of PLT is to make the patent process easier for the applicant at the international level by streamlining the regional and national patent procedures in member countries. Today, there are 19 contracting states and 59 additional nations have signed PLT. Learn more about the Patent Law Treaty from the World Intellectual Property Organization.

On June 1, 1869, inventor Thomas A. Edison received a patent for an electric voting machine for use by Congress.

Learn more about the history of electronic voting.