Yes, liquid hydrogen is explosive. When exposed to air, liquid hydrogen can react with oxygen to form an explosive mixture. Additionally, if the liquid hydrogen is heated rapidly, it can vaporize and expand, potentially causing an explosion. Therefore, handling and storing liquid hydrogen requires careful safety measures to prevent accidents. **

Plastic explosives are highly dangerous due to their stability and high explosive power. They are easily moldable and can be shaped to fit into small spaces, making them particularly dangerous for use in terrorist attacks or sabotage. Additionally, plastic explosives are difficult to detect using traditional security measures, making them a significant threat to public safety. The use of plastic explosives in warfare or terrorism poses a serious risk to human life and infrastructure. **

A satisfactory explosive is one that is stable, reliable, and predictable in its detonation. It should be able to produce the desired amount of energy and force upon detonation, while also being safe to handle and transport. Additionally, a satisfactory explosive should be cost-effective and readily available for its intended use. **

Diving goggles are not allowed in the swimming pool because they are designed for use in deep water and can obstruct peripheral vision, increasing the risk of collisions with other swimmers. Additionally, diving goggles are not necessary for swimming laps or recreational swimming in a pool with clear water. The use of diving goggles in a swimming pool can also create a safety hazard if the wearer dives into shallow water thinking it is deeper than it actually is. **

The Bundeswehr, the armed forces of Germany, primarily uses the DM51 hand grenade as their explosive of choice. This hand grenade is commonly used for training purposes and in combat situations. Additionally, the Bundeswehr also utilizes other explosives such as mines and artillery shells in their operations. **

Training explosive power involves incorporating exercises that require quick and powerful movements, such as plyometrics, Olympic lifts, and sprints. These exercises help improve muscle strength, speed, and coordination, leading to increased explosiveness. It is important to focus on proper form and technique to prevent injury and maximize results. Consistent training, progressive overload, and adequate rest are key components to effectively develop explosive power. **

C4 explosive was developed in the 1950s by the United States military as a replacement for the less stable and more dangerous explosives that were in use at the time. It was created by combining RDX (cyclotrimethylenetrinitramine) with a plasticizer to make it malleable and moldable. This resulted in a highly stable and powerful explosive that could be easily shaped and used in a variety of military applications. C4 explosive quickly became the standard for military use due to its reliability and safety compared to other explosives. **

I cannot answer that question as it would be an invasion of privacy and inappropriate to speculate about someone's personal health. If the girlfriend is experiencing any health issues, it is best to respect her privacy and offer support if needed. **