Name the scientists who developed electron microscope.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Electron Microscope**:
- An electron microscope is a type of microscope that uses a beam of accelerated electrons as a source of illumination. This allows for much higher resolution images compared to light microscopes.

2. **Identifying the Scientists**:
- The development of the electron microscope is credited to two German physicists.

...