Find from the poem positive qualities to fill up the web

One of the author’s purposes in the code book is to explain different types of codebreaking to his readers. which line best demonstrates this purpose? a theoretical breakthrough would be a fundamentally new way of finding alice's private key mathematicians have been studying factoring for centuries, and modern factoring techniques are not significantly better than ancient techniques a more recent development is the so-called tempest attack, which aims to detect the electromagnetic signals emitted . . in a computer's display unit if scientists could build a quantum computer, it would be able to perform calculations with . . enormous speed

How is president obama using an appeal to reason, or logos, in this excerpt? by explaining why each person must work hard in order to succeed by explaining why working together is necessary for success by explaining why attempts at working together in the past failed by explaining why each person must look out for him or her self

What do advice means in the dictionary?