Do you remember the cassette Walkman? It could barely hold 12 to 15 songs, until this sleek little white device came along and revolutionized the music industry. It has amazing storage capability, the largest model being able to hold more than 30,000 songs! Not surprisingly, iPod has made an astronomical number of sales (more than 110m units).
GPS or Global Positioning System was developed in 1978, and was made to pinpoint your exact position to within a couple of meters with the help of up to 32 satellites. It became a great invention for explorers, paramedics, and pilots but now even for common people who have GPS enabled devices in their cars or even GPS based apps on their smart phones.
Credit cards were first used in the 1920s, in the US, specifically to sell fuel to a growing number of automobile owners. Now a days credit cards are used everywhere from fuel payments to online shopping as they allow small short-term loans to be made quickly to a customer who doesn’t need to calculate a remaining balance before every transaction.
The first commercial microwave oven was sold in 1947. They are most commonly used for rapid reheating of previously-cooked foods and rapid heating of slowly-prepared cooking items, such as melting chocolates or butter. Any modern kitchen would be incomplete without this amazing and helpful machine.
This device does not need any introduction as every middle schooler knows its importance in our lives. The first electronic calculator was created in the 1960s, and the pocket size version became available in 1970s. From students to researchers to scientists, everyone carries a calculator these days and it would be hard to find a cell phone without a pre installed calculator app on it.