Isaac Newton invented a door with a square cutout so that his cat could enter and exit his laboratory without needing him to get up each time. He created this while studying the properties of light. Another unusual invention was the hula hoop, originally made of bamboo in Australia but redesigned by Vam-o using plastic, selling hundreds of millions of units over two years. The document discusses some lesser known inventions by famous inventors that were still helpful innovations.

1. Unusual inventions
The most famous inventors have some inventions which
aren’t famous, but they are helpful
By: Peric Ljubica VII-2

2. Door for the cat
One unusual invention was made by Isaac
Newton. He helped to science, and to cats
too. A lot of people think , he invented door
for the cats.
While he was sitting in his laboratory, he was
studing physical properties of light. His cat
was at home, and it often wanted to get in or
to get out. He didn’t want to get up all the
time, and he designed something. He
cropped a square on the door, so cat could
get in or get out whenever it wanted.

3. Hula-hoop
“Hula-hoop” was invented by Vam-o.
Someone saw girls, in Australia, who
were rotating ring around the waist. The
ring was made of bamboo. He designed
ring like that, but his ring was made of
plastic. He sold hundred of millions of
rings for two years.