Some of the world's finest memories are testing their recall abilities at the UK Open Memory Championships in London.
Twenty-six contestants from 11 countries are taking part in a number of disciplines in the two-day event.
In one of them, competitors will be given 10 minutes to learn the sequence of hundreds of playing cards.
World champion Ben Pridmore, from Derby, holds the record in this event, having correctly memorised 364 cards.
He will be joined at the championships by the youngest competitor, 15-year-old Eva Ball from Coventry.
She won the UK's Schools Memory Championship last month, by recalling 94 numbers, 137 words, 12 events and dates, 102 binary numbers and nine shuffled playing cards in sequence.
Everything relies on memory and without it, we would have no language
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