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1. Timeline of invention (28171 bytes)
   1: This is a chronological list of [[invention]]s.
   3: ...nvented in an impractical form many years before another inventor improves the invention into a practi...
   96: * [[1128]]: [[Cannon]] in [[History_of_China|China]]
   99: ...lasses|Eyeglasses]] in [[Italy in the Middle Ages|Northern Italy]]
   130: * [[1709]]: [[Piano]]: [[Bartolomeo Cristofori]]
2. USS Monitor (7466 bytes)
   27: |Speed:||8 knots (15 km/h)
   39: ...was below the waterline to prevent damage from cannon fire. ''Monitor'''s hull was constructed at the ...
   41: ...itted with Ericsson's [[propeller|marine screw]]. Ericsson anticipated some aspects of modern [[submarine]] ...
   51: ...[[Norrk?g]]; she was named ''John Ericsson'' in Honor of the engineer. She was followed by 14 more mon...
   57: ...n the [[Atlantic Ocean]] off [[Cape Hatteras]], [[North Carolina]].
3. Leif Ericson (4502 bytes)
   4: ...the first [[Europe]]an known to have discovered [[North America]]—more specifically, the region ...
   6: ...Greenland]], which he had named. As far as it is known, Leif Ericson had two brothers, [[Thorvald Erik...
   8: ...re the land that Bjarni had found, today known as North America.
   10: ...land he met was covered with flat rock slabs (Old Norse: ''hellur''). He therefore called it [[Hellula...
   14: ...arned Leif the [[nickname]] 'Leif the Lucky' (Old Norse: ''Leifr hinn heppni'').
4. Sweden (27111 bytes)
   1: ...d consisting of large peaceful forests and mountainous wilderness.
   3: ...nmark]] from the 12th century – 1710, and [[Norway]] in the [[16th century| 16th]] and [[17th ce...
   16: national_motto = none¹ |
   53: footnotes = ¹ För Sverige i tiden ([[Eng...
   72: ...lidated, with its center at the water-ways of the northern Baltic and the [[Gulf of Finland]].
5. Viking Age (10637 bytes)
   2: ...e East]], northern [[Africa]], and even reached [[North America]].
   6: ...rs to the [[Black Sea]] and then on to [[Constantinople]].
   8: .... The region now known as [[Normandy]], after its Norse raiders, was profoundly disrupted during this ...
   10: ...and culture into [[England]] in 1066, after the [[Norman Conquest]] of England.
   17: ...ical advances, such as the use of iron. Although another cause could well be pressure caused by the [[...
6. Propeller (12179 bytes)
   6: ...s efficiency are produced by a number of factors, notably adjustments to the helix angle, the angle be...
   11: ... the angle of attack will be high, possibly high enough to [[stall]] the airfoil. Since this is an ext...
   13: ...control of the [[Governor (device)|propeller governor]], in more advanced aircraft the mechanism is li...
   17: ...l aircraft the added cost, complexity, weight and noise of the system rarely make it worthwhile.
   21: ...craft with conventional propellers, therefore, do not usually fly faster than Mach 0.6. There are cert...
7. Mobile phone (30513 bytes)
   2: ...'''mobile phone''' is a device which behaves as a normal
   5: ...c Switched Telephone Network|telephone network]], normally by
   10: ...Siemens AG|Siemens]], [[SK Teletech]], and [[Sony Ericsson]].
   16: ...[fixed telephony]]. Such networks can often be economic, even with a small customer base, as mobile ne...
   18: ... to make to a mobile, but are free to receive) cannot be used, and as a result users pay to receive ca...

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