A newly discovered canyon lying beneath a 4-million-year-old ice sheet in northern Greenland appears to be at least 750 kilometres long and up to 800 meters deep.
Click here to read Bob's blog.
Are fall allergies making you miserable? Find out how your diet can help.
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.