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The g factor of boron-like tin ions is determined with an uncertainty of only 0.5 parts per billion. The second high-precision measurement for a ground-state boron-like system at all sets a new benchmark for quantum electrodynamics as well as multiple-electron interactions in heavy systems. Combining the new results with the recent electron g-factor measurement of hydrogen-like tin provides a potential for an independent determination of the fine-structure constant α.

Statements made by R. P. Feynman and M. Gell-Mann indicate that these persons have cast doubts on the veracity of Quantum Electrodynamics and Quantum Chromodynamics. An analysis of elements of these theories and an examination of well established experimental data substantiate their claims. The independent experimental examples that are discussed herein are known for decades. Unfortunately, these examples as well as their problematic aspects are ignored by the current mainstream literature

Our modern understanding of gravity comes from Albert Einstein’s theory of general relativity, which stands as one of the best-tested theories in science. General relativity predicted many phenomena years before they were observed, including black holes, gravitational waves, gravitational lensing, the expansion of the universe, and the different rates clocks run in a gravitational field. Today, researchers continue to test the theory’s predictions for a better understanding of how gravity works.

The status of experimental tests of general relativity and of theoretical frameworks for analyzing them are reviewed and updated. Einstein's equivalence principle (EEP) is well supported by experiments such as the Eotvos experiment, tests of local Lorentz invariance and clock experiments. Ongoing tests of EEP and of the inverse square law are searching for new interactions arising from unification or quantum gravity. Tests of general relativity at the post-Newtonian level have reached high precision, including the light deflection, the Shapiro time delay, the perihelion advance of Mercury, the Nordtvedt effect in lunar motion, and frame-dragging. Gravitational-wave damping has been detected in an amount that agrees with general relativity to better than half a percent using the Hulse-Taylor binary pulsar, and a growing family of other binary pulsar systems is yielding new tests, especially of strong-field effects. Current and future tests of relativity will center on strong gravity and gravitational waves.