The sixth day of the week and the number 13 both have foreboding reputations said to date from ancient times. It seems their inevitable conjunction from one to three times a year portends more misfortune than some credulous minds can bear. According to some sources it's the most widespread superstition in Canada today. Some people refuse to go to work on Friday the 13th; some won't eat in restaurants; many wouldn't think of setting a wedding on the date.  Science 9Karyotype ActivityScience 10Unit Conversion and Dimensional AnalysisBiology 122Complete Section 38-1:Food and Nutrition (see previous day)Physics 122Projectiles launched at an Angle (see previous)p. 543, #9-12