Every few months the computer giants put out a newer, better, and smaller computer. The first “portable computer," the IBM 5100, was put out in 1975, but it was hardly a little machine. It was only portable because it didn't take up several rooms. However, it was inevitable that these computers would shrink down and give birth to the laptops we know today that seem to shrink with time. In 1965, Thomas Moore, co-founder of Intel, made the prediction about the number of transistors they would be able to place on a processor would double every 18 months. This has continued since that time, uninterrupted, allowing for evermore powerful and smaller computers. So where are we now?
In truth, what is considered the "smallest computer" depends on your definition. Computers exist ubiquitously now, located in everything from watches to microwaves. There are tiny computers in traffic-lights and in your car. It is probably impossible to say who produces the smallest computing machines. When you get in the molecular level the conception of “computer" blurs with the natural processes of molecules like RNA. For instance, researchers at Caltech have built computers that function inside of yeast cells. On another level, there are computers who contain full operating systems, but are too small to be of much use for every day functions, such as this incredibly small Linux computer.
These, however, are obviously not laptops that we can actually use for our everyday use. Therefore, for the sake of the question, we will define a “laptop" as a portable computer that can accomplish basic everyday computing functions, such as email, word processing, and Internet. This definition, however, blurs into the realm of smart phones, which really do function rather like laptops. For all intents and purposes, smart phones and small portable devices are laptops that do not have full keyboards. So in the question “Who makes the smallest laptop," three assessments can be made: smallest smart phone, smallest portable device running a full, non-mobile operating system, and the smallest computer with a full keyboard.