200 years
people have been using it forever
A seesaw is a type of lever, which is one of the six classical simple machines. It consists of a long beam that pivots around a fulcrum, allowing two people on either end to move in opposite directions. The position of the fulcrum can adjust the mechanical advantage, enabling different weights to balance on either side.
Get a life and do your homework little 2 year old that eats pie
Since about the late 1900 (circa 1950)
It was originally patented England-1845.
people have been using it forever
The screw is one of the so-called "simple machines" from which many more complex machines are derived. A screw is essentially a long inclinewrapped around a shaft, so its mechanical advantage can be approached in the same way as the incline.
Do you mean "Pokie Machine" (Australian/ New Zealand slang for slot machine)? If so, then they were invented 1887.
Drums have been around probably since the time of early man. It is such a simple instrument. Another early human instrument is the bone-flute.
Gardening has been around since early man, when the neanderthals(and even earlier forms of man) grew simple crops to get by in their small villages.
how long has deforestation been around
As long as guns have been around.
Get a life and do your homework little 2 year old that eats pie
The simple subject is "it."
how long has the london eye been around for
As long as So Random has been around.
234 years fool