Before the invention of the bicycle in the 19th century, most people never ...
travelled more than 50 kilometres all their lives.
What is this?
Bicycle
What is this?
Hairdryer
Thanks to the hairdryer, people began ...
to wash their hair more often.
When was the explosion of new hairstyles?
In the 1920s
What did people think about the Earth before the 1500s?
The Earth was the centre of the Universe
Who is this?
Copernicus
What was the Copernicus theory about?
That the Earth goes around the Sun
What did millions of people buy in the 1980s?
personal computers
What is this?
Personal computer
