Post up facts and things that hardly anyone knows...... (for entertainment purposes only. NO need to fact check)

DeltaV said:

The world’s rarest hair and eye color combo is red hair and blue eyes.​

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Like red '69 GTXs with pewter interior. I'm aware of four in the last 50 years, and I owned one of them. Never saw one in the wild.

First girl I dated in 1970 was a redhead with brown eyes. I always thought that had to be really rare, combination of dominant and recessive genes. Her dad was a redhead with green eyes, mother brunette with brown eyes. Destiny that I drove my red GTX with saddle tan interior that same year.

The Beatles’ “A Day in the Life” Features a Whistle Only Dogs Can Hear​

Back in 2013, the Beatles’ Paul McCartney revealed a little canine-related trick the band had included on their seminal 1967 album, Sgt. Pepper’s Lonely Hearts Club Band. At the end of the album’s final track, “A Day in the Life,” the Fab Four added a tone pitched at 15 kilohertz, making the sound audible to dogs but difficult to hear for most humans. The tone was reportedly added at the request of John Lennon, who asked producer George Martin to dub in the high-pitched frequency. “We’d talk for hours about these frequencies below the sub that you couldn’t really hear and the high frequencies that only dogs could hear,” McCartney explained. “If you ever play Sgt. Pepper, watch your dog.”

Transparent Aluminum, the stuff mentioned in Star Trek, is real.

Going under the trade name ALON, it is a mixture of aluminum, oxygen and nitrogen. It's uses include armoured windows for aviation and military uses; being almost as hard as diamond, it resists scratches, and where a .50 cal bullet can penetrate traditional armoured glass up to 3.7", a laminated pane of ALON 1.6″ will stop it.

It's lighter than glass, and future uses likely will include car windows and cel. phone screens, although it's currently quite expensive.
Transparent Aluminum | Strength, Clarity & Applications