Why was it difficult for scientists to design and produce the robot, according to "Scientists Build Robot That Runs, Call It Cheetah'"? *

What is the probability of getting a license plate with 123 abc or abc 123?

How did the renaissance represented a break from the medieval period

During the revising stage in the writing process, the author freely explores topics for further inclusion in the work polishes the writing, fixing minor grammatical errors gets his or her ideas down in roughly the form he or she intends corrects major errors and improves the work's content