My experiment in money exchange was the temptation to set up a bank. The absence of any Islamic banking was also another factor in establishing Al-Rajhi Bank, which is now the world's biggest Islamic lender by market value.
If we pursue organic farming as our healthy food style, we can bring down cost of treatment to a great extent.
Usually, people in the Islamic world set aside one-third or one-fourth of their wealth for endowment, and that will be effective only after their death. But in my case, I decided to implement this decision in my lifetime itself.