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We prove that the existence of $\mathfrak{c}$ incomparable selectiveultrafilters implies the existence of a Wallace semigroup whose cube iscountably compact. In addition, assuming the existence of $2^{\mathfrak c}$incomparable selective ultrafilters and $2^{< 2^{\mathfrak{c}}} =2^{\mathfrak{c}}$, we obtain torsion-free topological groups with respect toComfort's question on the countable compactness of (infinite) powers of atopological group.

Comfort's question on powers in $\mathbb Q ^{(2^\mathfrak c)}$ and a Wallace semigroup whose cube is countably compact