The first edition of Saturday's Times appeared with a picture of "children in Wales" using welding masks to look at the eclipse "yesterday". The photo was credited to "Twitter".
But it's not the first time we've met these eclipse-watching kids with their welding masks, giving us reason to believe the picture wasn't taken in Wales yesterday. Here they are in 2012 looking at an eclipse in Japan:
A quick check with Google's reverse image search tool found the 2012 image. It's a good place to start when checking the authenticity of pictures on Twitter, where fake or deliberately misleading photos are commonplace.
The Times quickly updated its front page after the mistake came to light: