3 ms·

That's a funny perspective, considering that the greatest physicist in history is well known for mainly considering hypothetical and conceptual structures.

• AnimalMuppet 11y ago
  But Einstein's theories were still testable.
  • djsumdog 11y ago
    eventually. But not all of them were testable at the time, or only testable to a limited extent. The atomic clocks/airplane experiment is a good example a test that came way later.
  • Retra 11y ago
    He was doing good physics the whole time, even when his ideas weren't testable.