I would invest my bitcoins in studying because with enough money i can buy all the books i want to buy and want to build a career of my own and live a very enoughable and healthy life .
One of the smartest things I have seen in this thread, investing in your knowledge, schools is the best choice that man can make. School can take time and money, poor people need to waive on many things, but that will pay out one day.
If there isnt any profitable and safe investment in the moment, school is the second best choice. That is better then risking your money on some investment where you can lose all your money, knowledge from school stays for the rest of out lives, and that knowledge can bring a lot of money and food on the table.