Are we the first and the only civilization on the Earth?

Tweet

Hi friends, have you ever thought about this subject? Look at out history - in it's duration it hardly covers 10000 years. And what was before? Just cave people only, for hundeds and hundreds of thouthands years? Do you bielive in that really? Wel, look at our technical progress. It took just 200 years something to make the Big Jump. If you compare for example years of 700 AD and 900 AD - were there any significant differences in human equipment? Hard to say so. And then look at 1800 and 2000 AD. A bit different - isn't it? Of course progress accelerates, however did it really take so long to make second step since the first made in past centuries? Well even if it take 10000 years to build a plane since the first iron ask was made, you have these 10000 years 1000 times withing million years. Why do you think a Big Jump couldn't be made within 10000 years let's say somewhere 200000-300000 years ago? You may say that there must be some artefacts from previous civilization. First, once I've read in the internet (lost link unfortunatelly and it was in Russian) that in a case if our current civilization suddenly collapses any evedence of it is destroied very quicky, actually after 20000 years only artificial radioactive stuff will remain there all the other evidences will be completelly eliminated by nature. And than you know Earth has glacier and interglacier periods. And if an area was covered by 1 km ice field, one can hardly find anything artificial, because landscape changes so drastically... So, if a civilization existed between the last and last but one glaciers - it could be almost impossible to find out any evidence of it now. So, do you believe that there could exist any highly developed civilization(s) (like ours) in the deep past? Why do you think so? Do you know of any unexplaned artifacts? Other evidences?