It is estimated that there are over 3 million undiscovered shipwrecks in the world's oceans.

Recent studies have shown that people with sinus issues are four times more likely to have anxiety and twice as likely to have depression.

Tuesday, Wednesday, Thursday, and Friday are named after Norse gods: Tiw (Tyr), Woden (Odin), Thor, and Frigg (or Freyja). These day names reflect Roman influence, blending Germanic deities with the tradition of naming days after gods.

People started wearing pajamas, originally spelled “pyjamas,” instead of nightgowns so they’d be prepared to run outside in public during World War I air raids in England.

Studies show that chewing gum boosts cerebral blood flow and brain activity, improving reaction times, memory, alertness, productivity, and even math test scores compared to a control group.

A Boeing 747 burns approximately 4 liters (0.9 gallons) of fuel every second while in flight.

In Brazil, jails reduce prisoners' sentences by 4 days (up to 48 days a year) for every book they read and report on.