A non-optional social convention refers to a customary practice or behavior that is expected or required in a particular society or culture. These conventions are not optional and are considered necessary for individuals to adhere to in order to be accepted or respected within that social group. Failure to comply with these conventions may result in social consequences or ostracization. Examples of non-optional social conventions include greeting someone with a handshake or bowing in certain cultures, or following specific dress codes for formal events. **

Sulfur hexafluoride (SF6) is heavier than air, non-toxic, non-radioactive, and non-flammable. It is commonly used as an insulating gas in high-voltage electrical equipment and as a tracer gas for studying airflow patterns in buildings. SF6 is also used in the production of magnesium and aluminum, and as a cover gas in the metal industry. **

The song "Non Non Non" by Camelia Jordana is about empowerment and self-assertion. In the song, Jordana sings about saying "no" to things that don't align with her values and beliefs. The lyrics convey a message of standing up for oneself and not being afraid to assert boundaries. The song's upbeat and catchy melody adds to its empowering message. **

The caricature of the summit conference in Helsinki shows the leaders of the United States and Russia, Donald Trump and Vladimir Putin, sitting at a table with Trump holding a puppet string attached to Putin. This caricature is a satirical representation of the perception that Trump is under the control or influence of Putin, suggesting that Putin is pulling the strings and manipulating Trump. The image reflects the controversy and speculation surrounding the relationship between the two leaders and the potential influence of Russia on the United States. **

A symposium is a formal gathering or meeting where experts in a particular field come together to discuss and exchange ideas on a specific topic. It is often organized as a series of presentations, panel discussions, and Q&A sessions, allowing participants to share their knowledge and insights with each other. Symposia are commonly held in academic and professional settings, providing a platform for networking, collaboration, and learning within a specific discipline or industry. **

No, traditionally a hijab is worn by Muslim women as a symbol of modesty and privacy. It is not typically worn by non-female or non-Muslim individuals. The hijab is a religious and cultural symbol, and wearing it without being a part of that culture or religion could be seen as inappropriate or disrespectful. **

The term non-binary refers to a gender identity that does not fit within the traditional binary of male or female. Non-binary individuals may identify as a combination of both genders, neither gender, or as a different gender entirely. Non-binary is an umbrella term that encompasses a wide range of gender identities that do not conform to the binary understanding of gender. It is important to respect and acknowledge non-binary individuals and their unique experiences. **

Yes, East Tyrol is suitable for non-mountaineers and non-skiers as it offers a variety of activities such as hiking, cycling, and exploring the region's cultural and historical attractions. The region is known for its stunning natural landscapes, including the Hohe Tauern National Park, which provides opportunities for leisurely walks and nature observation. Additionally, visitors can enjoy the charming towns and villages, as well as the local cuisine and traditions, making it a great destination for those who prefer a more relaxed and cultural experience. **