To invent something is not very difficult.Here r some examples of small but useful inventions.
Sunglasses:As early as 1284,the first Sunglasses were invented in Italy.In 1752,James Ayscough used green and blue glasses to protect eyes from strong light.These first sunglasses were like eyeglasses.In 1929,American Edwin H-Lard invented a kind of new glasses to stop strong light coming into people's eyes.In 1937,this kind of sunglasses became popular around the world.
Umbrella:The umbrella was invented over 4000 years ago.It was first seen in China and Egypt.They were used to protect people from the sun.
The Chinese were the first to use waterproof umbrellas to protect people against rain.The umbrella started to became popular in Europe in the 1600s.Early umbrellas were made of wood .In 1852,an Englishman Samuel Fox invented the umbrella we use today.
Swimsuit:The earlist swimsuits for women were long and heavy.Ladies even sewed pieces of heavy things into swimsuits to stop it floating up and showing their legs.By the end of the 19th century,womem's swimsuits became lighter and shorter.In 1946,Frenchmen Jacques Heim and Louis Reard made the first bikini.The ad at that time was"Bikini--smaller than the smallest bathing suit in the world"