Effect of exercise-conditioned human serum on the viability of cancer cell cultures: A systematic review and meta-analysis.

Numerous epidemiological studies have shown the existence of a relationship between exercise and reduced risk of different types of cancer. In vitro studies have identified a direct effect of exercise-conditioned human serum on cancer cell lines of the lung, breast, prostate, and colon. The aim of this systematic review with meta-analysis (SRM) was to estimate the magnitude of the effect that exercise-conditioned human serum produced on the viability of cancer cell cultures.

Room for New Physics in the Rayleigh-Jeans Tail of the Cosmic Microwave Background.

We show that, despite stringent constraints on the shape of the main part of the cosmic microwave background (CMB) spectrum, there is considerable room for its modification within its Rayleigh-Jeans (RJ) end, ω≪T_{CMB}. We construct explicit new physics models that give an order one (or larger) increase of photon count in the RJ tail, which can be tested by existing and upcoming experiments aiming to detect the cosmological 21 cm emission or absorption signal. This class of models stipulates the decay of unstable particles to dark photons A^{'} that have a small mass, m_{A^{'}}∼10^{-14}-10^{-9}  eV, nonvanishing mixing angle ε with electromagnetism, and energies much smaller than T_{CMB}.