Euthanasia is an act by a person, typically a physician, actively and intentionally to end another person's life by some medical means at that person's explicit request. (Credit: Michael Jung/Shutterstock)
Pulpit Rock Park in Colorado Springs, Colorado, photographed with camera equipment sensitive to infrared wavelengths of light outside of the visible portion of the electromagnetic spectrum that humans can perceive. The "invisible" light is rendered…
Launching of a field-mobile, short-range, all-weather surface-to-air Roland missile. The West German–French Roland has been licensed for production in the United States for use as a U.S. Army air defense weapon. (U.S. Army)
The mushroom cloud from the first successfully detonated hydrogen bomb, Ivy Mike, which had a yield of about 10 megatons. Part of Operation Ivy by the United States military, Mike detonated at Eniwetok Atoll on October 31, 1952.
Design configuration of two types of fusion weapons: (a) fusion-boosted atomic bomb, (b) multistage hydrogen bomb. (Credit:A. DeVolpi et al., Born Secret: The H-Bomb, the Progressive Case and National Security, Pergamon, 1981)
Low-Cost Autonomous Attack System (LOCAAS; formerly Low-Cost Antiarmor Submunition). (a) Autonomous submunition, with length of 30 in. (0.75 m), wingspan of 40 in. (1.0 m), and weight of 90–100 lb (40–45 kg). (b) Various warhead modes.
User's views of pistol sights. (a) Standard notch-and-post “partridge” sight. (b) U-shaped notch variant in which a left-right alignment error appears as a height difference in the gaps. (c) Trapezoid-shaped variant with white dots for alignment in…