विश्व की पहली यांत्रिक घड़ी या पॉकेट वॉच का विकास किस देश में हुआ था?

In which year was the first permanent photograph successfully produced by Joseph Nicéphore Niépce?

Which of the following historical statements regarding soap manufacturing is true?

Until industrial advancements and isolation methods in the late 18th century, which component was not recognized or separated as an independent ingredient in traditional soap-making?