Cryptography : is it me ???

[jacek]

Good luck to the ones who won't be able to resist and attempt to crack it!

How much time do we have this time?

report mistakes in the content or the expression

p. 1
... through agriculture...
pregnant need ?
...how big were their herds...
... when it has to do with mathematics...
...however long mathematicians will keep on arguing... - this is a bit wierd, but I'm not sure why

p. 2
...processes can be found in earlier... - in what? something is missing here

The rest looks OK.