Silent farts are deadly. Loud ones only make sound, but have no smell effect.

This statement is false - silent farts are not necessarily 'deadlier' than loud ones. The odor comes from sulfur-containing compounds (like hydrogen sulfide) produced by gut bacteria during digestion, not from the sound. The sound is created by the vibration of the anal sphincter as gas escapes, which is unrelated to odor intensity. In fact, some very smelly farts can be completely silent.