Of Course You Can Use Math to Perfectly Fold a Notebook Page Into a Bookmark. Hey, you never know when it'll come in handy. By Caroline Delbert Published: Feb 10, 2020 5:42 PM EST.

CHAMPAIGN, Ill. — Two math-notebook pages recently authenticated as belonging to Abraham Lincoln suggest the 16th president, who was known to downplay his formal education, may have spent more ...

CHAMPAIGN, Ill. — Two math-notebook pages recently authenticated as belonging to Abraham Lincoln suggest the 16th president, who was known to downplay his formal education, may have spent more ...