1 pound = ounces
80 ounces = pounds
8000 pounds = tons
4 microseconds = nanoseconds
4 seconds = microseconds
5000000 nanoseconds = milliseconds
3000000000 nanoseconds = seconds
4 years = months
5 decades = quarters
4 decades = years
5 centuries = decades
4800 months = centuries
12000 quarters = millenniums