Category: 

Has Man Always Been Predominantly Right-Handed?

Humans have almost always been predominantly right-handed — at least for the past 500,000 years, it is believed. Researchers found that fossilized human teeth show marks that suggest that more than 90 percent of prehistoric humans were right-handed, which is about the same percentage of right-handed people today.

More facts about handedness:

  • Though there is evidence that handedness is genetic in humans, scientists are still simply not sure of exactly how it works.

  • Humans aren't the only ones who are mostly right-handed: cockroaches and horses are generally right-handed as well.

  • Studies show that right-handed people have, on average, a lifespan that is nine years longer than that of left-handed people, partially because left-handed people appear to be slightly more prone to accidents.

Follow wiseGEEK:
  twitter

More Info: www.sciencedaily.com, www.time.com

Discuss this Article

snjy
Post 1

how can i clean rust or corrosion in the condenser coil of an air conditioner?

Post your comments

Post Anonymously

Login

username
password
forgot password?

Register

username
password
confirm
email

Free Widgets for your Site/Blog

Helium is the only element that was discovered in space before it was found on Earth.  more...
 
December 10 ,  1948 :  The UN adopted the Universal Declaration on Human Rights.  more...