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. **

Yes, a bicycle home trainer can be very useful for individuals who want to stay active and fit at home. It provides a convenient way to get a cardiovascular workout without having to leave the house, especially during inclement weather or when time is limited. It can also be a great option for people who prefer to exercise in the comfort and privacy of their own home. Additionally, a bicycle home trainer can be a valuable tool for individuals recovering from injury or looking to improve their cycling performance. **

The United Kingdom is still technically united, as it consists of four constituent countries: England, Scotland, Wales, and Northern Ireland. However, there have been growing tensions and calls for independence in Scotland and Northern Ireland in recent years. The Brexit vote also highlighted divisions within the UK, with Scotland and Northern Ireland voting to remain in the EU while England and Wales voted to leave. The issue of unity within the UK remains a topic of debate and concern. **

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. **

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. **

In Islam, wearing a Manchester United jersey or any other sports team jersey is generally permissible as long as the clothing is modest and does not violate any Islamic principles. It is important to ensure that the jersey does not promote anything that goes against Islamic teachings, such as inappropriate slogans or symbols. Ultimately, as long as the clothing is modest and does not lead to any sinful behavior, wearing a Manchester United jersey should not be an issue in Islam. **

Whether wearing a Manchester United jersey to school is embarrassing or not depends on the individual's personal preferences and the culture of the school. Some people may feel proud and confident wearing their favorite team's jersey, while others may feel self-conscious or out of place. Ultimately, it's important to wear what makes you feel comfortable and confident, regardless of others' opinions. **

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. **