A nanoparticle assembler is constructed out of 500 million atoms and is able to place 2 million atoms per second.
A. How long does it take for the assembler to reproduce itself? 250 seconds
B. How many assemblers exist after one hour? 14.4 assemblers
C. How many assemblers exist after 3 hours? 43.2 assemblers
D. With the number of assemblers available after 3 hours, how long will it take them to build a device containing 10^20 atoms?