Related Clues:

• "A dolphin sleeps with one eye open," e.g
• Spiritual music genre
• It's undeniable to those characters at the end of 15 across
• ___-checker
• It's true!
• Observable truth
• What is on top of calories in butter? Every scientist knows that!
• It's the truth!
• Basis of a trivia question
• No mere opinion
• Reality; certainty
• Loud turn, in reality
• 'Octopuses can use tools,' e.g
• CeCe Winans genre
• Music that is so authoritative as not to be questioned