Is there a gene already in human DNA which would make humans two times smarter if repeated / made more active? That's what happens with weed rice. Btw the answ

Is there a gene already in human DNA which would make humans two times smarter if repeated / made more active? That's what happens with weed rice. Btw the answer can be yes. We are no longer constrained by food concerns but our genome does not account for that yet.