University of Michigan outdoes IBM with world's smallest 'computer' - CNET

The computer, which can stand on the tip of a grain of rice, is one-tenth the size of IBM's version.

How small is the world's smallest computer?

What is the smallest CPU you've ever seen used in a device? - Quora

Michigan Micro Mote (M3) makes history as the world's smallest computer

World's Smallest Computer

Are CPU's reaching the limits of miniaturisation and will chips have to become larger? - Quora

What is the smallest CPU currently? - Quora

Why are CPUs designed to be so small compared to the overall size of a computer? - Quora

World's Smallest Computer

Zenith Data Systems - Wikipedia

Microcontroller - Wikipedia

IBM announces development of 127-qubit quantum processor

What is the smallest (bitwise) CPU that any version of Unix has ever been implemented on? - Quora