Who were the radical republicans? what did they achieve while in power in congress during reconstruction?

The public space for government speech in ancient athens was called

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal

Historians sometimes rely on video recordings in researching past events because