It was it is knowed was with age 20 was age in which the most inventions were uncovered. I will pass in my opinion two of them which they were the most important for mankind.
First of them is mobil phones. This invention permitted to communicate with the help of telephone which it need not be connected to telephone net, but with the help of radio waves. To to bring into contact every moze sie with different man in every place on the ground now. The life stood a lot of simpler and more pleasant. We from these small devices can also send short textual messages (sms). This form of communication spread at youth particularly. But nothing is ideal unfortunately... it was proved that sale frequent using to conversations telephone can cause the brain disease.
Second invention 20 age which would like to describe then computer. This device unlocked for man great possibilities... first helps us in communicating( with the help of internet), can second thanks him to relax on example listening musics or look at films... you is third with data huge bank at which we keep the most important information. We with the help of internet can robic all this literally it means: to buy clothes or different objects, to pay bills, to do bank transfers...
I Think, that these two examples show how important 20 age for technical inventions