Different Chinese inventions helped increase long-distance trade. The Chinese built large ships with which helped with
steering. About 1150, Chinese inventors in the Song dynasty perfected the which helped Chinese sailors navigate their
ships' locations and sail farther from land. As a result of these inventions, the Chinese were able to sail to Southeast Asia, India, and other
places to the west.
--World History & Geograpahy

1920 census

the census was scheduled for january the 1st, as the government believed that more farmers would be in their homes by that time instead of april. the census did not ask about unemployment, the number of children, and how long was a couple married were not taken into consideration. individuals were considered as residents of the places they normally slept, not the places were they worked at or visited.

2010 census

the census was scheduled for april 1st, 2010. it was the shortest census in history: it only contained 10 questions related to name, age, gender, ethnicity, relationship, and whether the citizen owned a home or rented one. the government launched a website in order to provide the citizens with information regarding the census. there were also "teach census weeks" in schools nationwide.

Internal combustion engines