Virus.
This question is highly subjective, but one author stands out as a good response: Molière was the greatest of the French playwrights of the seventeenth century, and his works are still commonly performed today.
Especially valued were the bi-colored tulips, known as 'broken' tulips. Tulip bulbs naturally produce only solid color blooms. If aphids infest the bulb, an insect-borne disease causes the flower's color to streak in broken lines against white petals. As the bulb blooms year after year, the streaked patterns change, becoming more erratic. But the disease also weakens the bulb, killing the plant prematurely.
hydrogen!!
Creates employees who are highly skilled in a specific area
it's possible, but highly unlikely.
During the first century, Rome was the most highly populated city, with estimates ranging from 500,000 to over 1 million inhabitants. It was the center of the Roman Empire and a bustling metropolis with a diverse population.
Aluminum is highly conductive and creates an electrical pathway to ground.
serfdom
i highly doubt it and even if they could you would have to pay.
highly persecuted, frowned upon except when needed
It's highly unlikely.
In the seventeenth century, people believed that witches had made a pact with the devil and possessed supernatural powers to harm others. This fear of witches was heightened by religious beliefs and the prevailing social and political conditions, such as the Protestant Reformation and the Thirty Years' War. The lack of scientific understanding and the scapegoating of marginalized individuals, particularly women, also contributed to the fear and persecution of witches.