The following was obtained from www.rd.com (Reader Digest) and written by Elizabeth Yuko:

"Fact: The world’s oldest wooden wheel has been around for more than 5,000 years

It was found in 2002, approximately 12 miles south of Ljubljana, the capital of Slovenia, and is now housed in the city’s museum. Radiocarbon dating was used to determine the wheel’s age, which is somewhere between 5,100 and 5,350 years old. Closer to home, these are the oldest tourist attractions in every state.

Fact: Dead skin cells are a main ingredient in household dust

Here’s an interesting science fact for you: According to researchers at Imperial College London, humans shed around 200 million skin cells each hour—and they have to go somewhere when we’re indoors. If the idea of skin dust isn’t sitting well with you, you should know that a report from the American Chemical Society found that a skin oil called squalene naturally helps reduce indoor ozone levels by up to 15 percent.

Fact: Sudan has more pyramids than any country in the world

Not only does Sudan have more pyramids than Egypt, but the numbers aren’t even close. While 138 pyramids have been discovered in Egypt, Sudan boasts around 255. Next, see if you can answer these real Jeopardy! questions about geography.

Fact: The bumblebee bat is the world’s smallest mammal
Weighing in at 0.05 to 0.07 ounces, with a head-to-body length of 1.14 to 1.29 inches and a wingspan of 5.1 to 5.7 inches, the bumblebee bat—also known as Kitti’s hog-nosed bat—is the smallest mammal in the world, according to the Guinness Book of World Records. To see this tiny bat for yourself, you’d have to visit one of a select few limestone caves on the Khwae Noi River in Kanchanaburi Province of southwest Thailand.

Fact: The cornea is one of only two parts of the human body without blood vessels

The cornea is the clear part of the eye that covers the pupil and other parts of the eye. Cartilage and the cornea are the only types tissue in the human body that do not contain blood vessels, according to scientists at the Harvard Department of Ophthalmology’s Schepens Eye Research Institute. Your eye also has some other bizarre features you probably didn’t know about.

Fact: The circulatory system is more than 60,000 miles long

If a child’s entire circulatory system—we’re talking veins, arteries, and capillaries—were laid out flat, it would stretch for more than 60,000 miles, according to the Franklin Institute. By the time we reach adulthood, our bodies have become home to approximately 100,000 miles of blood vessels. That’s just one of the mind-blowing facts that sound made up (but aren’t).

Fact: German chocolate cake was invented in Texas

The “German” part of German chocolate cake comes from an American man—not a European country. Specifically, it’s named after Sam German, who in 1852 created the formula for a mild dark baking chocolate bar for Baker’s Chocolate Company, which was subsequently named Baker’s German’s Sweet Chocolate. Fast-forward to June 13, 1957. The Dallas Morning Star published the recipe for the cake, invented and submitted by a reader identified as Mrs. George Clay, according to What’s Cooking America.

Fact: The Philippines consists of 7,641 islands

The Philippines is an archipelago, which means it’s made up of a group of islands—7,641 islands, to be exact. That figure does not include the thousands of sandbars and other landforms that emerge during low tide.

Fact: There’s enough gold inside Earth to coat the planet

Turns out, there’s quite a bit of gold on—or, really, in—our planet: 99 percent of the precious metal can be found in the Earth’s core, Discover Magazine reports. How much is there? Enough to coat the entire surface of the Earth in 1.5 feet of gold.

Fact: Human beings can use only a small fraction of Earth’s water

In school, we were taught that most (specifically, 71 percent) of the planet’s surface is covered in water. While that’s true, humans can use only 0.007 percent of that water, according to National Geographic. That’s because only about 2.5 percent of Earth’s water is fresh water, and only 1 percent of that is accessible. The rest makes up glaciers and snowfields.

Fact: The brand name Spam is a combination of “spice” and “ham”

This is one of those interesting facts you probably thought you knew but actually didn’t. Contrary to American mythology, Spam is not an acronym for “Scientifically Processed Animal Matter” or “Shoulder of Pork and Ham,” Eater reports.
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Well that is enough for today. Have to keep some for the next time. :)

Reference: https://www.rd.com/list/interesting-facts/