Draw the Lewis structure for 1,1-dimethylhydrazine [(CH_3)_2N NH_2], a compound used as a rocket fuell. What is the hybridization for the two nitrogen atoms in this molecule? What orbitals overlap to form the bond between the nitrogen atoms?

Are not the nitrogen atoms $s {p}^{3} - \text{hybridized}$
The bonding in the hydrazine is electron precise and each nitrogen atom is $s {p}^{3} - \text{hybridized}$. $\angle N - N - C$ bond-angles would be distorted somewhat from ${109.5}^{\circ}$ due to the stereochemically active lone pairs.