Challenges of nanotechnology according to computer science.

1. Cost: Nanotechnology is an expensive technology to develop and implement.

2. Safety: Nanotechnology poses potential safety risks due to its small size and potential to interact with biological systems.

3. Regulation: Nanotechnology is a relatively new technology and there are few regulations in place to govern its use.

4. Environmental Impact: Nanotechnology has the potential to cause environmental damage due to its small size and potential to interact with biological systems.

5. Data Storage: Nanotechnology presents challenges in terms of data storage due to its small size and potential to interact with biological systems.

6. Scalability: Nanotechnology presents challenges in terms of scalability due to its small size and potential to interact with biological systems.

7. Security: Nanotechnology presents challenges in terms of security due to its small size and potential to interact with biological systems.