What would you like to do?

What percentage of all scientists who have ever lived are alive today?

already exists.

Would you like to merge this question into it?

already exists as an alternate of this question.

Would you like to make it the primary and merge this question into it?

exists and is an alternate of .

About 90%. The reason that the number is so high is that while people were discovering things via some method that resembled the scientific method, "scientist" was not an occupation. Science was pretty much invented by Sir Isaac Newton and the number of scientists has exploded and increased exponentially since this time, hence the large percentage of scientists alive today.
For a full analysis of this question, including research on the number of PhD's granted in major countries since 1900, see Eric Gastfriend's work on the Future of Life Institute's blog. He concludes that around 80-90% is probably correct.
Thanks for the feedback!

What percentage of people alive today are descendants of Cain?

There is no way to know with certainty the exact percentage. God took from Cain the ability to till the ground productively and made him a wandering vagabond. Not a successful

How do scientists know Utahraptor ever lived?

Because they found fossils of a dinosaur that once lived in the  area of modern Utah, and named that dinosaur "Utahraptor".   In other words: the dinosaur lived, died, le