What does this quote mean “more people would learn from their mistakes if they weren't so busy denying them”

What would be a good starter sentence for writing a review over hidden figures?

Write a five-minute oral presentation about the call of the wild, writing for an audience of your peers. what did you find most fascinating or interesting about the story, and what did you think were its most important points? include one visual element to support your ideas; this may be a short slideshow. then, make small changes to your speech to adapt it to be presented to a formal audience. enter both versions of your speech (informal and formal) in the space below, and include your selected visual element. if possible, present your speech to an audience to receive feedback.

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