The wikipedia page on Johnsson-Nyquist noise gives some explanation and explains the relations to black-body radiation, described by Planck.

The wikipedia page on Shot Noise

Johnsson's noise paper from 1928

Nyquist paper from 1928 give some additional intuitition to the $4 k_{B} R T B$ formula.

Nyquist's formula is essentially the same as that derived by Planck in 1901 for electromagnetic radiation of a blackbody in one dimension—i.e., it is the one-dimensional version of Planck's law of blackbody radiation.^[8] In other words, a hot resistor will create electromagnetic waves on a transmission line just as a hot object will create electromagnetic waves in free space.

MEMS, Atomic Force Microscopy and such stuff

Feynman's "There's Plenty of Room at the Bottom: An Invitation to Enter a New Field of Physics"

Feynman's lecture in paper form

Feynman's lecture on youtube: Link

Some short videos about AFM

Link Link Link

Here is an elementary explanation of how typical cheap MEMS accelerometer, gyro and magnetometer work today.

Link