Before telephones the only way to communicate with each other was to write letters. It took days before the letter got to the recipient and it took days for the writer to get the reply. Then telephone...
Alfred Nobel was the first person who realized and understood the explosive nature of nitroglycerin after is was discovered by Ascanio Sobrero in 1847. Based on this explosive potential of nitroglycer...
Some call the 1920s the roaring 20s. I personally think so because the war had just ended and many soldiers are coming back. People started businesses and were doing quite well therefore the people ha...