Dark matter can't be detected. That's because it doesn't exist. That doesn't matter, people are still looking for it. It's an example of how we use faith in science.
Experimentation and Dark Matter
Tithes and Offerings
It may seem like an odd departure from our discussion of the war in heaven to bring up tithes and offerings, but it may be an important clue. Why a tithe, 10%? What's the significance of this number?