Top 10 innovations of 20th century

10. Digital camera

9. ATM

8. Man made satellites and GPS

7. GUI (Graphical User Interface)

6. Refrigerator

5.  Television

 4. Internet

3. Cell Phone

2. Air planes

1. Computer

Honourable mentions:

X-rays, MRI and Ultra sound scans

Credit cards:

Practical Innovations that changed the world!

1. Faraday's discovery of induced current from changing magnetic flux which runs our economy now. Think of a world without electricity - no light, no tv, no laptop and no internet!
2. Graham Bell's invention of Telephone - It totally changed the way we communicate. Precursor to this is Telegram and Cellphone is successor.
3. James Watt's Steam Engine and Trains - it changed the way people move.
4. Wright brothers' invention of air planes - of course, it also changed the way we move.
5. Computers - it changed the way people do work, buy, entertain. All kinds of reservations, shopping and great scientific endeavours like 'curiosity'.
6. Ability to make controlled fire. It changed the way we eat or build things.
7. Agriculture - It again changed the way we eat.
8. Ability to forge metals.
9. Counting in base 10.

 Did I miss something more important?