Who is credited with inventing the modern ballpoint pen? Laszlo Biro John Jacob Parker Lewis Waterman Milton Reynolds None Who invented the first practical helicopter? Igor Sikorsky Otto Lilienthal Alberto Santos-Dumont Frank Whittle None Who is known for inventing the first digital computer? Bjorn Stroustrup Alan Turing Konrad Zuse Bill Gates None Who invented the first practical electric razor? Jacob Schick King C. Gillette Harry Razor Remington Rand None Who is credited with inventing the first microwave oven? Raytheon Corporation Albert Einstein Heinrich Hertz Percy Spencer None Time's up
