Researchers found that "wobbles" in the planet's core have both sped up and slowed down our days by about a tenth of a millisecond.
Click here to read Bob's blog.
Library of Congress
Joan of Arc is captured in battle, Bonnie and Clyde die in a hail of…
No email address was supplied by
To complete your registration on this site, please supply an address.
Please confirm or modify the email address to which you will have subscription offers sent.
For a more personalized experience, please supply the following optional information.