  Breitenberger's uncertainty principle on the torus $\mathbb{T}$ and its
higher-dimensional analogue on $\mathbb{S}^{d-1}$ are well understood. We give
describe an entire family of uncertainty principles on compact manifolds
$(M,g)$, which includes the classical Heisenberg-Weyl uncertainty principle
(for $M=B(0,1) \subset \mathbb{R}^d$ the unit ball with the flat metric) and
the Goh-Goodman uncertainty principle (for $M=\mathbb{S}^{d-1}$ with the
canonical metric) as special cases. This raises a new geometric problem related
to small-curvature low-distortion embeddings: given a function $f:M \rightarrow
\mathbb{R}$, which uncertainty principle in our family yields the best result?
We give a (far from optimal) answer for the torus, discuss disconnected
manifolds and state a variety of other open problems.
