What invention or innovation from the last 20 years or so would you say has changed life that most? what evidence can you find to support answer?

Which chinese invention is used to measur the strength of earthquakeswhich chinese invention is used to measure the strength of earthquakes

How and to what extent did the enlightenment thinkers challenge social and political aspect of the world in the 1700s?

Traditionally, in order to be jewish, a person must have a jewish mother, follow the jewish religion, and abide by kosher food limitations. although they are not ironclad, these customs set "traditional" jewish people apart from others. what concept does this serve to illustrate?