So *that's* how pancakes were invented! At 02:20 PM 8/29/2017, James Propp wrote:

I have now irrevocably peed this idea into the global meme-pool:

https://www.youtube.com/watch?v=JeAnr-EJ48M

Jim Propp

On Sat, Jan 11, 2014 at 10:37 PM, James Propp <jamespropp@gmail.com> wrote:

...

Has anyone ever proposed in the Annals of Improbable Research or a similar venue that, in addition to undergoing periodic reversals of its magnetic field, Earth is also subject to occasional short-lasting reversals of its gravitational field?

Such a phenomenon would handily explain selective extinction of megafauna: a mouse could survive an upward fall for five seconds followed by a downward fall for five seconds followed by an extreme deceleration, but a mastodon would not fare as well. :-)

Jim Propp