While the model is well-known and recognised, what do we know about the behind-the-scenes of this photo? Tongue out, hair in a mess, mischievous look: the photo of the famous Albert Einstein was taken ...

In 1911, Albert Einstein penned an extraordinary letter to Marie Curie. Curie was going through one of the most tumultuous periods of her life, with public opinion pushing strongly against her.

But trolling isn't a modern-day phenomenon. A resurfaced century-old letter from Albert Einstein to Marie Curie shows that the legendary female scientist, who discovered the X-ray and won two ...