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14 Grand Engineering Challenges for the 21st century that, if met, would greatly improve our world.

1. Make solar energy economical

2. Provide energy from fusion

3. Provide access to clean water

4. Reverse-engineer the brain

5. Advance personalized learning

6. Develop carbon sequestration methods

7. Engineer the tools of scientific discovery

8. Restore and improve urban infrastructure

9. Advance health informatics

10. Prevent nuclear terror

11. Engineer better medicines

12. Enhance virtual reality

13. Manage the nitrogen cycle

14. Secure cyberspace

This is good. But I think it's early that we name the challenges of the 21st century. That's because we haven't even lived the 10th part of this century. Maybe in future we'll face other, unexpected challenges.