1. Cryptocurrency is often subject to hacking and cyber attacks.

2. Different investment vehicles may be subject to different fees and expenses, and investors should consider these costs when making investment decisions.

3. Investment returns are subject to taxes, and investors should consider the tax implications of their investments.

4. Mathematics is an essential subject for understanding and solving problems in many fields.

5. Online tutoring or coaching: If you have expertise in a particular subject, you can offer online tutoring or coaching services

6. Research: Depending on the subject of your book, you may need to conduct research to gather information and support your ideas

7. The existence of God has been a subject of debate among philosophers, theologians, and scientists for centuries.

8. The professor delivered a series of lectures on the subject of neuroscience.

9. The stock market can be volatile and subject to fluctuations due to a variety of factors such as economic conditions, political events, and investor sentiment.

10. Women have been subject to violence and abuse, including domestic violence and sexual assault.