THE INVENTIONS THAT CHANGED OUR LIVES FOREVER!!!!!!!!!!

1. THE JET ENGINE ( Invented by HANS VON OHAIN AND FRANK WHITTLE ) 

Inventors had been working on the concept of jet engines for many years. The main problem was that any engine capable of jet propulsion created too much heat within the chamber, which meant it became unstable and often exploded. Whittle's brilliant but simple solution was to create 10 combustion chambers, each of which would produce an impressive thrust, rather than having one large chamber that would produce an uncontrollable reaction.

In 1936, Whittle set up a company called Power Jets Ltd and in 1937, using newly available alloys that were strong and light, he produced a viable engine that worked under laboratory conditions. By 1941 the engine was installed in the prototype of a new jet fighter. The next jet to be made, the Gloster Meteor, was actually used by the RAF in 1944. Unknown to the British, however, a German physicist Hans von Ohain had simultaneously invented a jet engine in Germany. It flew before Whittle's, although it was kept as a military secret in years before the war.

The jet engine opened up the age of international travel. Its use as a passenger aircraft allowing people to cross the Atlantic at great speed and in greater safety than before was soon recognized. In the 1950s, the American aerospace company Boeing took over the lead in jet-powered airliners. The Boeing 707 entered service in 1958.

2. JEANS( Invented by JACOB DAVIS AND LEVI STRAUSS )
The waist overalls were made of denim, a cotton twill material dyed blue with indigo. The problem with them was that the pockets were too easily ripped. Jacob Davis, a Latvian tailor living in Nevada, came up with the idea of using rivets on the pockets to strengthen them. Needing a business partner, he contacted dry-goods wholesaler Levi Strauss and together they filed for and received the patent for "Fastening Pockets Openings" in 1873. Around 1890, the trousers were assigned the number 501, which they still bear today. For nearly 20 years, Levi Strauss & Co. was the only company allowed to make riveted clothing. When the patent expired numerous companies began to make cotton jeans with rivets.

3. THE PLAYING CARDS ( UNKNOWN INVENTOR )
The precise origin of playing cars is not known. Experts differ as to whether they first appeared in China, India, or Egypt. The earliest European references to playing cards date back to the 1370s and come from Italy, France, Spain, and the Southern Germany, when the games were introduced by the Arabs.

No cards from this early period survive but literary sources indicate that the cards were handmade, painted in various colours, and even finished in gold. Islamic cards used courtly representations of kings and their entourage, but differences in culture across Europe led to the evolution of a diverse range of playing card types. The French suit system first emerged in the late 1400s, using spades, hearts, diamonds, and clubs, and became the most widely used suit system.

The basic designs have remained the same, but improvements in production processes allowed the paper cards to be coated with plastic to increase their durability.