What could Immanuel Kant, Benjamin Franklin and Albert Einstein have in common with a four-year-old? They all pretty much share the same IQ.

Heidi Hankins, a four-year-old from the UK has a 159 IQ. The 159 IQ is only one point below Einstein and physicist Stephen Hawking.

Due to Hankins outstanding IQ she was admitted into Mensa, the international high IQ society. The organization has members in over 100 countries, states their website. The goal of the group is to provide a forum for intellectual exchange among its members. Mensa does this through lectures, discussions, journals, gatherings and investigations.

Mensa is an elite group, only open to those who have attained a score within the upper two percent of the general population on an approved intelligence test that has been properly administered and supervised. Hankins IQ score of 159 compares to the average score of 100.

According to Mena, unusual memory, intolerance of other children, awareness of world events and reading at an early age are signs of a gifted child.

We always thought Heidi was pretty bright because she was reading early, said the four-year-old father, Matthew Hankins, a lecturer at the University of Southampton. He continued to tell the Hampshire Chronicle that, I happen to specialize in measuring IQs in children, and I was curious about her and the results were off the scale.

According Heidi's proud parents she was drawing princesses and animals at 14 months, and at 18 months taught herself to read using a computer.

Hankins is among some of the youngest to join Mensa. Others include:

Elise Tan Roberts

In 2009, two-years and four months old Elise Tan Roberts became the youngest Mensa member ever in 2009. With an IQ of 156, the child from North London can recite the English alphabet, count to 10 in Spanish, as well as name different types of triangles, reports the BBC. According to the Stanford-Binet Intelligence Scale test that Roberts took, she is in the top 0.2 percent in her age group in the UK.

Oscar Wrigley

At two years, five months and 11 days Oscar Wrigley became the youngest boy in Britain to join Mensa. Wrigley has an IQ of about 160. Oscar was recently telling my wife about the reproductive cycle of penguins, his father Joe, an IT specialist, told the Daily Mail in 2009.

Georgia Brown 2007

In 2007, Georgia Brown was the youngest girl to join Mensa at just 1041 days old. From Aldershot, Hampshire, Brown has an IQ of 152. According to Brown's mother, the child had been crawling at 5 months, walking at nine months and at 18 months was having proper conversations.