In three dimensional space, a flyscreen lies along the plane with the equation $2x-y-2z=1$ and the trajectory of a bee as a fuction of time $t$ is given by $r(t)=ti+t^{2}j+t^{3}k$ for $tt=\frac{-1+\sqrt[\phantom{2}]{13}}{6}t=\frac{-1+\sqrt[\phantom{2}]{7}}{3}t=\frac{1+\sqrt[\phantom{2}]{7}}{3}t=\frac{2+\sqrt[\phantom{2}]{13}}{6}t=\frac{\sqrt[\phantom{2}]{13}}{6}-.$ Find all times $t$ when the bee $is$ flying parallel $to$ the screen.