Modus ponens (Latin for ‘mode that affirms’) is a valid form of logical deduction. It is a conditional form (if-then) that we use frequently in everyday reasoning.

An argument from ignorance is NOT an argument from someone who is ignorant! Rather, it is a logical fallacy claiming something is true because it has not been proven false, or false because it has not been proven true. Thus, it uses a lack of evidence as evidence itself; this shifts the burden of proof.