1. The apartment was full of cockroaches at night as well.

2. In the ongoing battle between humans and cockroaches, the insects have a leg up.

3. Researchers also developed an invisible fence to keep cockroaches from wandering away from rescue sites.

4. Tests also included placing a foil cover over the heads of the cockroaches to block any visual clues.

5. They found the machine was able to roll onto its side and slide past obstacles in small spaces, just as cockroaches do.