Inventors and Scientific Discoveries

James Watson and Francis Crick discovered the double-helix structure of DNA in 1953 at Cambridge University. They used Rosalind Franklin's X-ray diffraction data (Photo 51) to deduce that DNA has a twisted ladder structure with paired bases.

Wilhelm Röntgen received the first Nobel Prize in Physics in 1901 for his discovery of X-rays. Alfred Nobel established the prizes but never won one. C.V. Raman won in 1930, and Isaac Newton predates the Nobel prizes entirely.

Galileo Galilei invented the thermometer in 1607, one of his many scientific contributions. Einstein is from the 20th century, Newton's work was later (17th century but different inventions), and C.V. Raman is from the modern era (Nobel Prize in 1930).

John Boyd Dunlop developed the first practical pneumatic (air-filled) tire in 1888 for his son's tricycle. His invention revolutionized transportation by providing a much smoother ride compared to solid rubber tires, and the Dunlop tire brand still exists today.

Archimedes discovered the principle of buoyancy (often called the 'Eureka' moment) while trying to determine whether a golden crown was pure gold or contained silver. This method of measuring volume through water displacement is known as Archimedes' Principle. The 'Golden Crown' story is the classic example used to teach this concept.

Tim Berners-Lee invented HTML and the World Wide Web in 1989-1990 at CERN. He created the first web browser, web server, and HTML markup language to share information among researchers.

Guglielmo Marconi is credited as the inventor of wireless telegraphy, for which he received the Nobel Prize in Physics in 1909. He developed the first practical system of wireless telegraphy based on radio waves. Option B correctly identifies Marconi as the inventor.

Charles Babbage is widely regarded as the 'father of the computer' for designing the first mechanical computer, the Analytical Engine, in the 1830s. Though never completed in his lifetime, his designs laid the foundation for modern computing. Option A correctly identifies Babbage as the inventor of the first computer concept.

Isaac Newton (along with Gottfried Wilhelm Leibniz) is credited as the inventor of calculus. Newton developed his version of calculus in the mid-1660s, calling it 'the method of fluxions.' Option B correctly identifies Newton as one of the inventors of calculus.

The Nobel Prize is named after Alfred Nobel, the Swedish inventor who invented dynamite. Nobel established the prize in his will, using his fortune from the dynamite patent and other inventions. The other options are inventions of different scientists: nuclear energy involved many researchers, the microscope was developed by Antonie van Leeuwenhoek, and radio waves were discovered by Heinrich Hertz.

To solve this question, the user needs to know about the history of toilets and their different types.

Option A: Handicapped toilets are designed for people with disabilities and are equipped with features such as handrails, lower sinks, and wider stalls. This option is incorrect because Arthur Giblin did not invent the first handicapped toilet.

Option B: Modern toilets are the standard type of toilets found in homes and buildings today. This option is incorrect because Arthur Giblin did not invent the first modern toilet.

Option C: Public toilets are toilets that are available for use by the general public. This option is incorrect because Arthur Giblin did not invent the first public toilet.

Option D: Flushable toilets are designed to be flushed with water to remove waste. This option is correct because Arthur Giblin is credited with inventing the first flushable toilet in 1890.

Therefore, the answer is: D.

Albert Parkhouse, an employee at a wire manufacturing company in Alabama, invented the coat hanger in 1902 when he couldn't find a hook to hang his coat. He bent a piece of wire into a coat-shaped hanger, and the design was later patented and commercialized. Door hooks and cloth hooks already existed, while clothespins are an unrelated invention for hanging laundry on lines.

John Spilsbury, a British cartographer and engraver, created the first jigsaw puzzle around 1766 by mounting a map on wooden sheet and cutting it into pieces along country boundaries. He intended it as an educational tool to teach children geography. Maps were his professional specialty as a map maker, not carpentry or teaching.