When we think about Particle physics the first thing that comes to mind is colliders and high energies. In this talk, I will describe how low energy experiments can probe new phenomena, new particles and new forces of nature. I will demonstrate this through two seemingly different experiments that test the same aspects of Dark Matter. In String Theory, fundamental constants, such as the electron mass or charge, are determined by fields known as moduli. When these fields are the Dark Matter of our Universe, they will cause the fundamental constants to oscillate locally with a frequency set by the Dark Matter mass. For frequencies smaller than 1 Hz atomic clocks can easily pick up these oscillations with their immense sensitivity. For higher frequencies above 1 kHz, Dark Matter can excite acoustic modes in resonant mass detectors originally designed to detect gravitational radiation from astrophysical sources. Both techniques can extend searches for this type of Dark Matter by several order of magnitude in the near future.