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-1
votes
1answer
87 views

What is the exact date and year when the first car got invented? [closed]

Cars. They have been around for over 100 years, I know that. But does anyone know the exact date and year that cars were invented? That is my question and I would like responses. Thank you.
7
votes
1answer
70 views

Who invented modern bookends? (both model T and model L)

In ancient times the bookends were made from very heavy materials to sustain the weight of the books, while the modern ones use a smarter technique: while they are light, they are shaped so that they ...
9
votes
2answers
1k views

How much faster were the printing presses than hand writing?

How many times faster were the printing presses, which gave Europe an advantage over other continents in term of access to knowledge, compared to copying of books by hand?
3
votes
1answer
41 views

When was the electric iron introduced to the state of Georgia?

I am aware that the electric iron was invented in 1882 by Henry W. Seely, but I would like to find out when rich and middle-class Georgians started using it.
4
votes
1answer
99 views

How did Leonardo plan on moving his tank?

Was there a plan for how to propel the circular wooden tank design of Leonardo da Vinci's? It seems far too heavy to be powered Flintstones-style by the people inside, but it also seems too small for ...
1
vote
0answers
46 views

Was there a race to patent the use of Freon as a home refrigerator coolant?

Thomas Midgely, Jr.'s hands were in two of the most detrimental scientific breakthroughs of the 20th century: the proliferation of leaded gasoline and the use of Freon (a chlorofluorocarbon) as a ...