The haha-effect: Our ancestors may have laughed themselves into becoming humans. http://link.springer.com/article/10.3758/s13423-016-1122-6 …pic.twitter.com/EBeFrPm29C
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Chimps have a prequel which they don't use for social grooming. The "monster" started the real thing at Homo ergaster/erectus era.
which leads to a discussion of what they first laughed at.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.