We have that the above mentioned device all have the concept of radiation in common
Radiation
From the question we are told
What does a light bulb, a toaster, a radio, and a computer all have in common???
Generally
it is important to not that Radiation can be defined as the emission of energy from a body in the form of a wave.
Therefore
We can see that with all of the above mentioned device are device that radiate one form of wave or particle
light bulb -Heat and Light waves
The above mentioned device all have the concept of radiation in common
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