The half-life of sodium-25 is 1.0 minute. Starting with 1 kg of this isotope, how

much will remain after half an hour?

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon