Asked by Isaiah

When did the first human exist? And when did they start populating the earth?
Answered by bobpursley
There is no answer to this, as "humans" are evolved, and are still evolving. When did the first catfish appear? There is no answer.

Answered by Isaiah
Thanks and What did humans evolve from?
Answered by bobpursley
http://humanorigins.si.edu/education/introduction-human-evolution
Answered by Isaiah
So six million years ago?
Answered by Isaiah
I just want to know when did humans start populating?
Answered by bobpursley
six million years ago is a good estimate. No one wrote it down.
Answered by Isaiah
So nothing is accurate? But estimated
Answered by Isaiah
Let say the humans started populating six million years ago, how come there is only over 7 billion people? I mean if you calculate the population today should be in 100 trillions
Answered by Writeacher
You're not accounting for

~ poor hygiene and understanding of germs
~ diseases and illnesses
~ pandemics
~ infant mortality rates
~ wars
~ accidents

... and all sorts of other reasons for humans' deaths.
Answered by isaiah
I am accounting those too and it still doesn't add up to it.
Answered by isaiah
it's still no where near
Answered by Scott
"modern" humans (us) arrived on the scene about 30 - 50 thousand years ago
around the end of the last ice age

there was limited interbreeding with the Neanderthals -- who were on the way out

there have NOT been people like us around for 6 million years

plug a different time into your calculation
Answered by Ms. Sue
Apparently you didn't read the site that bobpursley posted. Our human ancestors appeared about 6 million years ago.
Answered by Scott
the key here is "modern" humans (like us)
Isaiah is using 6 million in some population growth scenario and getting weird results
he's not interested in the start of the genus homo, he want to count people