Question

A. Is there a source you can point me to that explains evolution in clear language? 
B. I heard a lecture claiming that microevolution is a fact and cannot be disputed,
but it was argued there that there is no proof at all for macroevolution. If, for example, a number of stages of human beings were found in archaeological excavations, that is no proof that they developed one from another; that is only a hypothesis. It could be that each one existed separately and the inferior varieties died out.
Especially in light of the fact that, as you described in your book, the probability that evolution would occur is negligible.
 As I understand it, there are two approaches:
Yours in the book, to argue that if something highly improbable happened, that proves there was a designer;
and another approach, that it never happened at all and it is all just speculation, since the probability is negligible.
{For example, if we found the house of a person we do not know, and on the table there is a bank document stating that he has a billion dollars in his account,
and we also find a diary in which he writes that he won the lottery on such-and-such a date for a million dollars, and on the next day again won the lottery for exactly a million dollars, and so on for 1,000 consecutive days,
would we assume that he has a billion dollars in the bank because of the circumstantial evidence that he won the lottery 1,000 days in a row, or would we assume that he is simply the owner of a successful business?
And as for the evidence from his diary, perhaps there is a more reasonable explanation—for example, that he means figuratively that he made a good deal in which he earned a million dollars that day.}
Why did you assume in your book that the first approach is the correct one?