Revise how to work out the gradient of a straight line in maths and what formula to use to calculate the value change in this Bitesize guide.

Amateur photographer Cessna Kutz took two photos of the "horizontal rainbow" from her porch located on Lake Sammamish in Washington.

The unusual rainbow felt like a sign to the photographer, who has been sharing a variety of images as she isolates at home during the coronavirus outbreak.

A weather phenomenon known as a “fire rainbow” was seen over one of the lighthouses guarding the shipwreck-laden Graveyard of the Atlantic off North Carolina.