Here's how many times you need to reuse your reusable grocery bags | CNN

Cotton tote or heavy-duty plastic bag? The answer to what's the greenest replacement for a single-use plastic bag isn't straightforward, but the advice boils down to this: Reuse whatever bags you have at home, as many times as you can.

Mark your calendar for the strongest meteor shower of the year | CNN

The Geminids meteor shower is the strongest meteor shower of the year, with a rate of up to 120 visible meteors per hour. It will peak the night of December 13 into early hours of December 14.