Explore the concept of thermal dark energy and other string candidates in this 44-minute conference talk from the Kavli Institute for Theoretical Physics. Delve into the implications of string theory on low-energy laws of physics and the string landscape. Examine the swampland program and its impact on high-energy theory research, including the Weak Gravity Conjecture. Investigate the connection between quantum gravity and accessible energy laws, and learn how particle phenomenology can challenge Standard Model assumptions. Discover the resurgence of bottom-up, low-energy S-matrix techniques and their applications in effective field theories. Gain insights into the modern on-shell amplitudes program and the bootstrap approach. Cover topics such as runaway string modulus, the cosmological constant problem, light hidden sectors, scalar potentials, and portal interactions. Engage with questions and discussions on cosmology, inflation, and effective dark energy.