Heather was in the midst of an excellent speech on campus history when she made a minor mistake by giving the wrong date for the opening of a campus building. she suddenly stopped speaking and said, "oh, i messed up." then she provided the correct date. the rest of her speech went well, but all she could think about afterward was her mistake. what is the major piece of advice from your textbook that heather needs to be reminded about

Researchers have found that it takes to view a mental image that is larger or covers more distance than a smaller or more compact one.

“dear sir: it is with great reluctance, i trouble you on a subject, which does not fall within your province; but it is a subject that occasions me more distress, than i have felt, since the commencement of the war; and which loudly demands the most zealous exertions of every person of weight and authority, who is interested in the success of our affairs. i mean the present dreadful situation of the army for want of provisions, and the miserable prospects before us, with respect to futurity. it is more alarming than you will probably conceive, for, to form a just idea, it were necessary to be on the spot. for some days past, there has been little less, than a famine in camp. a part of the army has been a week, without any kind of flesh, and the rest for three or four days. naked and starving as they are, we cannot enough admire the incomparable patience and fidelity of the soldiery, that they have not been ere this excited by their sufferings, to a general mutiny or dispersion. strong symptoms, however, discontent have appeared in particular instances; and nothing but the most acitive efforts every where can long avert so shocking a catastrophe.” what’s the central idea?

What greek scientist created a screw to move water for irrigation?