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During the exam , a magnetic field and radio waves are used to create cross-sectional images of the structures within your brain . More often than not , he would draw the line in one continuous motion to create a closed loop . Your health care provider will perform a thorough evaluation to determine if you have trichotillomania . Computerized tomography uses a computer to create cross-sectional images ( like slices ) of your brain and head by combining images from an X-ray unit that rotates around your body . Iraq continues to weigh on the nation 's finances , accounting for well over half of the current year 's projected deficit of $ 244 billion . But I decided to stay . The pain may be most severe at first , when the medication begins to wear off . They may wear wigs , style their hair in a way to disguise bald patches or wear false eyelashes . Women may be more likely to experience hangovers than men are , perhaps because women tend to weigh less and have lower percentages of total body water . " I say to you today , stay loose . You 'll find that you can create the first figure ( left ) in one continuous motion but not the second , which requires two loops . The human imagination fills in the rest , connecting the dots to create a menagerie of celestial creatures that inhabit the sky . The researchers estimate that these nanocomputers could collectively perform a billion operations per second with greater than 99.8 percent accuracy per operation while consuming less than a billionth of a watt of power . Every night , the clock automatically checks the radio-delivered official time signal and makes whatever adjustments are necessary to stay synchronized . All three pairs tended to stay within sight the rest of the way . Ackland and Butler reported that the threshold depends on a single criterion : the fraction of competitors in a given event who encounter others and can stay with them .