Modern technology has been around for several years depending on what you mean.Modern means now a new so in the sense of the xbox 360 is a modern games console.Where as a toaster could be classed as modern to because its not like your cooking it over a fire.
technology, in some form, has existed as long as there have been modern humans! our prehuman ancesters even had simple technology.
Modern humans have been around for 200,000 years.
If you mean the metal armoured modern battleships, they have been around since about 1900
The current KWD has been around since 1994.
This question is very difficult and long... Simply because 'Technology' is not a simple and easy word. If you think about modern technology you think of computers however if you mean the current technology to what ever line that maybe then Technology has been around since the dawn of time no matter which you believe (religion or otherwise) because Farmers still exist in both creationist stories.
They have been looking for cures as long as cancer has been around. The search for cures has been around since ancient times. It may not have been called cancer at the time, but it has been around longer than modern science.
Present. Homo-Sapien's have been around for as long as modern man.
how long has deforestation been around
As long as guns have been around.
Violins have been around for a long time, and similar forms of the violin have been around even longer. The modern European violin evolved from various stringed instruments of the Middle East. The earliest description of the instrument was in 1556.
Modern humans, or Homo sapiens, have been on Earth for about 0.2% of Earth's history, which is approximately 200,000 years. Earth is estimated to be around 4.5 billion years old.
Freight trains have been around for a long time, but the modern trains we have today can do much more. Unfortanutly, I do not have the answer, but good luck on your report.