A 400g sample Iodine-131 has a half-life of 8 days. How much will be left after 40 days?

Which best explains why an iceberg floats?

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

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