Daniel Tammet has memorized Pi to the 22,514th digit. He speaks ten different languages, including one of his own invention, and he can multiply enormous sums in his head within a matter of seconds.

Lived experiences shared by identical twins Helen Besgrove and Kirsty Neal show how deeply this trait can shape memory, creativity and even professional life. Medical insights help explain why this ...

Synesthesia is a condition where a stimulation of one sense causes a simultaneous activation of another unrelated sense, merging two senses together. For example, synesthetes (a person with ...