Rocketswereprobablyinventedbyaccidentabout 2000 yearsago.TheChinesehad a formofgunpowderwhichwasputinbambootubesandthrownintofirestomake(1)___•duringfestivals.Perhapssomeofthetubesjumpedoutofthefireinsteadofexplodinginit.TheChinesediscoveredthatthegunpowder(2)___ fromthetubecouldliftitintotheair.Theideaofth...
Previous chapter: Rockets home pageA dart propelled from a cannon was probably invented in England or elsewhere in Western Europe around 1327. The emergence of firearms is dated around 1313. (Photo illustration)SUPPORT THIS PROJECT!Reactive principleAlthough in the 20th century rockets came to ...
called the Kuiper belt. Kuiper (said "KYE-per") was the last name of the person who first wrote about it. Most of the things in the Kupier belt are hard to see through telescopes. After the Kuiper belt comes the Oort cloud. Scientists think this is where comets come from. It is ve...
2 For example, a person who speaks fifteen languages, or a medical doctor who operates on the brain. Still, many people would agree that there is something special about scientists who build rockets. Maybe it has something to do with the mystery of space travel.Moving pictures from before ...
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I give her full credit for making me the person who I am today. To thank her,I?d like to share some of the things she taught me. 1. 36 No matter how hard things got,my mom could always joke about them. It has taught me things are never,ever,end-of-the-world kind of bad. ...
The person who found a solution to this problem revolutionized the concept of the elevator. But was it Elisha Otis, or Otis Tufts? While working in a factory in 1852, Elisha Otis and his sons came up with an elevator design that employed a safety device. A wooden frame at the top of ...
Who should be responsible for this? Or maybe you try to help someone in danger, but you 1 hurt the person. Will you get in trouble for this? China’s Civil Code (《民法典》) will give you the 2 . On May 28, the National People’s Congress (全国人民代表大会) agreed China’s ...
Many new things are invented each year. Interestingly, some inventions are named after the people who invented them, making the inventions and inventors easier to be remembered. The bowler hat is named after London hat-makers Thomas and William Bowler. The brothers received an order from Edward ...