An angel investor assesses two biotech trends represented by vectors $\mathbff = \beginpmatrix 5 \\ k \\ 2 \endpmatrix$ and $\mathbfg = \beginpmatrix -1 \\ 3 \\ 6 \endpmatrix$, seeking $k$ such that $\mathbff$ and $\mathbfg$ are orthogonal. - Crosslake