Bobdown wrote:

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13. A coat hanger is 44 inches long when straightened.

 

They are all TRUE!

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I just measured 3 wire coat hangers and they are 42.5 inches, even factoring in the spiral twice.

So not true!

Could people check this rubbish before they copy & paste.

A substantial portion are false, or at least questionable, but we all expected that, didn't we?

2.  Alfred Hitchc0ck did not have a belly button.

Alfred Hitchc0ck was born with a belly button, but it was "removed" during surgery.

http://www.johangrimonprez.be/main/Art_Works_BellyButton.html

23. The first Harley Davidson motorcycle built in 1903 used a tomato can for a carburettor.

The "tomato can" reference was just a comparison.

https://www.quora.com/Is-it-true-that-when-Harley-Davidson-in-1903-made-their-first-motorcycle-they-used-a-tomato-can-for-the-carburettor

5.  When you sneeze, all bodily functions stop, even your heart!

Nonsense. 

"Electrical signals that control your heart rate arent affected by the physiological changes that happen when you sneeze. But the heart may get delayed for a second or two before resuming its regular rhythm."

https://www.healthline.com/health/does-your-heart-stop-when-you-sneeze

6.  Only 7% of the population are lefties.

Today it's about 10%. In earlier days many left handers were brought up as right handers.

https://en.wikipedia.org/wiki/Handedness

17. The REAL reason ostriches stick their head in the sand is to search for water.

No, it's to turn their eggs over. They get their water from the vegetation they eat.

https://web.archive.org/web/20150203050900/http://ostriches.org/FoF-HeadInSand.htm

20. Michael Jackson owned the rights to the South Carolina State Anthem.

Jackson owned the rights to Apple Records songs, one of which would have been "Carolina In My Mind" by James Taylor. However, this is not the same as "South Carolina On My Mind", which is one of two South Carolina state songs.

https://boards.straightdope.com/t/does-michael-jackson-really-own-the-rights-to-the-south-carolina-state-anthem/332572/2

18. The only two animals that can see behind themselves without turning their heads are the rabbit and the parrot.

The chameleon is another one.

https://en.wikipedia.org/wiki/Chameleon

24. Most hospitals make money by selling the umbilical cords cut from women who give birth. They are used in vein transplant surgery.

I only found one study that attempted to perform such transplants. I didn't find any reference which stated that this was a current practice. 

In fact umbilical cord blood contains stem cells, and these are used in transplants to treat "leukemia, lymphoma, multiple myeloma, aplastic anemia, sickle cell and other diseases".

https://medicalxpress.com/news/2009-06-hospital-umbilical-cords.html

This pioneering surgery uses a baby's own umbilical vein as a shunt for repairing its own heart:

https://answers.childrenshospital.org/using-newborns-own-umbilical-cords-as-shunts-for-heart-surgery/

10. The toothbrush was invented in 1498.

Here are two opposing claims:

"The first bristle toothbrush resembling the modern one was found in China. Used during the Tang Dynasty (619907), it consisted of hog bristles."

https://en.wikipedia.org/wiki/Toothbrush#Toothbrush

"The bristle toothbrush, similar to the type used today, was not invented until 1498 in China. The bristles were actually the stiff, coarse hairs taken from the back of a hogs neck and attached to handles made of bone or bamboo."

https://www.loc.gov/everyday-mysteries/technology/item/who-invented-the-toothbrush-and-when-was-it-invented/

Bobdown wrote:

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Hope you don't dream about spiders tonight........... 

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I checked that out, too. It's probably bogus, so I'm not worried. One web site suggested that, if you're sleeping with your mouth open, you're probably snoring, and this would scare any spiders away. In fact, if I was worried, I would block up all my orifices.  

BTW, I did check out the coat hangers. I figured that the only way such a claim could stand is if there was a standard governing their dimensions. There isn't, but the closest I could find was this compilation by Carol:

https://www.mytidycorner.com/typical-clothes-hanger-dimensions/

Edit:

A couple of years ago I had a Huntsman living between the wall and basin in my bathroom. We reached an understanding that he (she?) could remain provided that he kept the c0ckroaches away. This arrangement worked well until one day I found him on the wall in my bedroom. Then I had no choice but to escort him outside.