Across
- 5. German inventor Johannes Gutenberg invented the --- --- sometime between 1440 and 1450. Key to its development was the hand mold, a new molding technique that enabled the rapid creation of large quantities of metal movable type.
- 6. Ancient Romans are credited as one of the first societies to use --- in architecture, with Roman bathhouses and iconic sites such as the Colosseumand Pantheon dome constructed using --- mixed with volcanic ash, lime, and seawater.
- 7. The earliest rudimentary --- is thought to date back to the 10th century in China, when people inoculated small scratches in the skin with small doses of smallpox to provide protection against the disease.
Down
- 1. The first --- dates back to 1800, when Italian physicist Alessandro Volta wrapped stacked discs of copper and zinc in a cloth, submerged it in salty water and discovered that it conducted energy.
- 2. Like many famous inventions, the --- was discovered by accident. In 1895, German engineer and physicist Wilhelm Conrad Röntgen was undertaking a two-month study into the potential of radiation. He soon discovered that X-rays could pass through human tissues to show a clear picture of the skeleton and organs.
- 3. Before the invention of the --- in 3500 B.C., humans were severely limited in how much stuff we could transport over land, and how far. The --- itself wasn't the most difficult part of "inventing the ---." When it came time to connect a non-moving platform to that rolling cylinder, things got tricky, according to David Anthony, an emeritus professor of anthropology at Hartwick College.
- 4. In 1928, the Scottish scientist Alexander Fleming noticed a bacteria-filled Petri dish in his laboratory with its lid accidentally ajar. The sample had become contaminated with a mold, and everywhere the mold was, the bacteria was dead. That antibiotic mold turned out to be the fungus ---.
- 6. The first --- was invented in China during the Han dynasty between the 2nd Century B.C. and 1st Century A.D.; it was made of lodestone, a naturally-magnetized iron ore, the attractive properties of which they had been studying for centuries.