When did nickels become magnetic?

What is 45 plus 2? What is the density of a cube of water measuring 9cmX2cmX6cm with a mass of 5.4g? What compound word can you make with this word pile? What is 10 divided by 22? What is the sum of integers from 1 10? What is the circumference of a circle given that it's area is 225pi square inches? What is an expression equal to four more multiplied by 3? What day of the week was June 5 1974? The median of five numbers is 11 and the mode is 9 and the mean is 12 What are the five numbers? What is 2.899 rounded up to? How long is 9.1 meters in feet? How many boules are in a set? One meter equals hom many squere feet? What does 90 plus 90 equal? What is a rational number and why is it important? What is the square root of 3901? Equate 25000 dollars a year to dollars per hour? What concludes the no of significant figures that should be maintain in recording the measurement using vernier caliper? How can a 23 year old grow taller if he is 5'7'? Could the range ever be greater than the largest number of a data set?