Trường Tiểu học Thủ Lệ
How can the motion of an object that is not moving change?
An object at rest has zero velocity – and (in the absence of an unbalanced force) will remain with a…Read More »
How did the first cells obtain their energy?
The earliest cells were probably heterotrophs. Most likely they got their energy from other molecules in the organic “soup.” However,…Read More »
How did the Chinese compass impact the world?
Appearing in China around the 4th century BC, primitive compasses showed people the way not literally, but figuratively, helping them…Read More »
How did Rome expand its power beyond Italy and what were the effects of this expansion?
Rome was able to gain its empire in large part by extending some form of citizenship to many of the…Read More »
How did Assyrian kings rule the conquered peoples?
How did Assyrians prevent conquered peoples from rebelling? By forcing them to resettle in distant lands. How did Assyrian kings…Read More »
How did Romans transport goods?
Ancient Romans traveled by carriage, chariot, walking, riding horses, and riding on a litter. What was a litter? A litter…Read More »
How did the Homestead Act encourage settlement of the Great Plains?
The Homestead Act encouraged western migration by providing settlers with 160 acres of land in exchange for a nominal filing…Read More »
How deep does kelp grow?
Because of their dependency upon light for photosynthesis, kelp forests form in shallow open waters and are rarely found deeper…Read More »
How did Protestant Reformation start?
The Protestant Reformation began in Wittenberg, Germany, on October 31, 1517, when Martin Luther, a teacher and a monk, published…Read More »
How did public transportation change life in the cities?
It is a lifeline for millions of Americans connecting them to people, places and possibilities. It also builds thriving communities,…Read More »