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 ...
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?
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.
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 ...
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 ...