The Chinese first used gunpowder to make explosives used by the military in the Five Dynasties and Ten Kingdoms period (五代十国, Wǔdài Shíguó). The Chinese invented cannons made of cast iron, cast iron landmines, and rockets, ...
Rocketswereprobablyinventedbyaccidentabout 2000 yearsago.TheChinesehad a formofgunpowderwhichwasputinbambootubesandthrownintofirestomake(1)___•duringfestivals.Perhapssomeofthetubesjumpedoutofthefireinsteadofexplodinginit.TheChinesediscoveredthatthegunpowder(2)___ fromthetubecouldliftitintotheair.Theideaofth...
Second, smiles are nice. People may try to look nice on the outside by exercising or wearing nice clothes.3That is because it is easy to be around someone who is smiling and happy. Third, smiles have power. Both smiling and laughing can easily and quickly spread from one person to anot...
Rockets were probably invented by accident about 2000 years ago.The Chinese had a form of gunpowder which was put in bamboo tubes and thrown into fires to make(1)___ during festivals.Perhaps some of the tubes jumped out of the fire instead of exploding in it.The Chinese(2)___ that the...
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 ...
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 ...
Our future will depend on computers, robots, nuclear power and rockets ships, all of __14.___ only make sense if we understand science. If a person does not understand __15.__ makes these things work, they might as well be magic. People without ___16.__ understanding of...
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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 ...
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