a)
- Lipstick was invented in Iraq.
- Electric razors were introduced in the 1930s.
- Milk chocolate was first sold in the 1870s.
- The first email was sent in 1991.
- 426 million dollars were spent on jewellery in the world in 2010.
- In Ancient Egypt, the metals copper and lead were used to make eyeliner.
- The world's first MP3 player was produced in 1997 in Korea.
- More than 30 million i-pads were sold in 2011.
- The first wallpaper was printed in France in the 18th century.
- The vacuum cleaner was invented by a cleaner who became ill every time he cleaned a floor.
b)
4 is incorrect: the first email was sent in 1971.