A toddler has become a member of Mensa and already knows all 50 American states and the alphabet - in three languages.
Brainy Izaak Miller, four, has an IQ of 154 - the top one percent for his age range.
He passed the Mensa admission test aged three and has now earned his place in the prestigious intelligence club.
The talented toddler taught himself to read books by two and can write the English, Greek and Arabic alphabet - despite having no Greek or Arabic heritage.
Mum Michelle Nelson, 32, said "he just loves language" and has already asked for books of the Russian alphabet.
With a reading age of seven years ten months and maths skills usually seen in the average six-and-a-half-year-old, his Mensa acceptance letter arrived on April 24.
Ms Nelson, a secondary school teacher, said: "Izaak is my only child so going through the process of parenting I was shocked that one day he could just read.
"It was more from being outside with him and him reading signs on the bus and the underground, reading names of stations and reading instructions on posters like 'please sit down take a seat.
"People were looking at him and asking whether he was at school because they couldn't believe a child that young could read.
"Every time I walk out the house someone compliments him."
She has an eight-year-old step-daughter, Layla Miller, but raised her from three and not birth so did not know what to expect when Izaak grew up.
Izaak can also count to ten in Spanish, knows all the planets in order, and spends time putting alphabet blocks by corresponding items, such as 'A' next to his 'aquarium.'
Ms Nelson, from Cheshunt, Hertfordshire, added: "I had to tell the nursery [about his Arabic] - they thought he was writing nonsense!
"They couldn't believe it because none of them know that alphabet."
Izaak took the Wechsler Preschool and Primary Scale of Intelligence test with educational psychologist Dr Peter Congdon.
Dr Congdon recommended he gets tested again in two to four years to see how his IQ improves.
His report described Izaak as 'a child of very superior general intelligence and scholastic attainments to match.'
Because Mensa's tests can not be applied to under 10-year-olds, they must take an independent assessment beforehand as prior evidence for the application.
"He likes to ask questions and act like a teacher," Ms Nelson added.
In lockdown he has been performing science experiments, creating volcanoes with bicarbonate of soda, vinegar and food colouring for instance.
She said: "It is exhausting - especially with lockdown - but rewarding. Every time I look at him I feel nothing but pride. People say to me he is going to go on to do fantastic things.
"I have high aspirations for him. I know he can achieve and do great things."
Ms Nelson said people often assume his intelligence is because she is a teacher and picked up a love for learning.
"People thought I was home schooling him but I wasn't," she added. "He picks up everything like a sponge."
She said her and Izaak's dad Jon Miller, 31, an engineer, don't know where his love of learning came from - but just try to stop him getting bored.
"I teach children myself and the one worry for me, especially with boys, is that he doesn't get bored," she said.
"He has the tendency to be lazy and I don't want him to be that cool kid where he feels it's not cool to be smart and suddenly he becomes lazy."
For his birthday he asked for a telescope, and his mum insisted he has no interest in toys or films like Marvel or Spiderman.
"There is no point trying to encourage him to play with these toys - he isn't interested," she said.
And despite his brains she insisted he retains a 'great sense of humour' telling jokes like: 'Where does a cow hang its paintings? In a moo-seum.'
He learned the the Greek and Arabic alphabet by teaching himself from YouTube videos.
The youngest-ever member was two years and four months old at the time of joining.