Earth Day started as a US ‘teach-in’ 56 years ago. Now it’s a global event

Millions of people around the world will pause, at least for a moment, to mark Earth Day. The annual event is Wednesday.

Today in Chicago History: ‘Mystery of Al Capone’s Vaults’ — with host Geraldo Rivera — seeks gangster’s riches

Here’s a look back at what happened in the Chicago area on April 21, according to the Tribune’s archives. Is an important ...