Millikan, Neher, and Pickering (1943) found that low-energy electrons in cosmic ray showers from lead are very abundant, suggesting Jánossy's estimate of 50% of shower electrons penetrating the chamber wall is reasonable, despite the thin wall. However, photons in the chamber wall may reduce effective absorption. Using Bhabha and Chakraborty's results, the energy $ E_0 $ was calculated as 13.5 BeV, but considering oblique incidence, this value may be too high. Jánossy's 20 BeV estimate might be excessive, with 10 BeV being more likely. Balloon experiments by Millikan, Neher, and Pickering (1943) showed no change in vertical intensity at latitudes above 45°, suggesting a cut-off energy higher than 4 BeV, not 2 BeV. Max Born and the author proposed a theory of superconductivity based on electron-ionic lattice interactions near Brillouin zone boundaries. This theory explains why superconducting elements lie in two columns of the periodic table, near transition metals. The theory suggests an upper limit of about 11% for primary radiation electrons, but this is uncertain due to shower theory limitations. The existence of electrons in primary cosmic radiation remains unresolved. The theory also explains superconductivity in alloys formed from elements on either side of the superconductive columns, as their combined Brillouin zones satisfy the superconductivity condition. Examples include BiAu₂ and CuS. The author concludes that further experiments are needed to resolve the question of primary cosmic radiation electrons.Millikan, Neher, and Pickering (1943) found that low-energy electrons in cosmic ray showers from lead are very abundant, suggesting Jánossy's estimate of 50% of shower electrons penetrating the chamber wall is reasonable, despite the thin wall. However, photons in the chamber wall may reduce effective absorption. Using Bhabha and Chakraborty's results, the energy $ E_0 $ was calculated as 13.5 BeV, but considering oblique incidence, this value may be too high. Jánossy's 20 BeV estimate might be excessive, with 10 BeV being more likely. Balloon experiments by Millikan, Neher, and Pickering (1943) showed no change in vertical intensity at latitudes above 45°, suggesting a cut-off energy higher than 4 BeV, not 2 BeV. Max Born and the author proposed a theory of superconductivity based on electron-ionic lattice interactions near Brillouin zone boundaries. This theory explains why superconducting elements lie in two columns of the periodic table, near transition metals. The theory suggests an upper limit of about 11% for primary radiation electrons, but this is uncertain due to shower theory limitations. The existence of electrons in primary cosmic radiation remains unresolved. The theory also explains superconductivity in alloys formed from elements on either side of the superconductive columns, as their combined Brillouin zones satisfy the superconductivity condition. Examples include BiAu₂ and CuS. The author concludes that further experiments are needed to resolve the question of primary cosmic radiation electrons.