  Kac's ten-dimensional simple Jordan superalgebra over a field of
characteristic 5 is obtained from a process of semisimplification, via tensor
categories, from the exceptional simple Jordan algebra (or Albert algebra),
together with a suitable order 5 automorphism. This explains McCrimmon's
'bizarre result' asserting that, in characteristic 5, Kac's superalgebra is a
sort of 'degree 3 Jordan superalgebra'. As an outcome, the exceptional simple
Lie superalgebra el(5;5), specific of characteristic 5, is obtained from the
simple Lie algebra of type $E_8$ and an order 5 automorphism. In the process,
precise recipes to obtain superalgebras from algebras in the category of
representations of the cyclic group $C_p$, over a field of characteristic
$p>2$, are given.
