Didn't know that there is 'homeopathic plutonium'. But it's not a surprise that homeopathy posts devoid of any reason are highly rewarded on steemit, there are many of these 'alternative-fact people' here and many believe in even more absurd conspiracy theories.

For science posts consider also the steemstem tag (it's usually less spammed with low-quality and pseudoscience stuff). The @steemstem project curates science posts, for more information see for example SteemSTEM Winter 2017-2018 Project Update, you can also find a link to the discord chat server of the community there.