Albert Einstein wasn't always the old guy with the bushy white hair. Once upon a time he was once just a cute little three-year-old -- and the same is true, of course, for all scientific geniuses. Just have a look at this amazing collection of "baby scientist" photos HuffPost Science has assembled -- from legendary physicists and chemists to a celebrated chimp-lover and the first known computer program writer.

Regrettably, we couldn't include some familiar scientific greats, including the guys who invented peanut butter and the traffic signal, the man famous for trapping atoms with lasers, or the guy who formulated those fundamental laws of motion and gravity -- as we couldn't track down their baby photos. But there are plenty of fun photos to see. And for each scientist and inventor in our collection, we've included both baby/child and adult photos -- so you can make it into a game, seeing how many of the baby scientists you can identify.

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  • Who is this budding theoretical physicist?

    This stylish baby genius grew up to figure out a very important theory.

  • It's Albert Einstein!

    (1879-1955) Most famous for developing his theory of relativity and for the world's most famous equation, E = mc². Here he is on his 72nd birthday.

  • Who is this future evolutionary theorist?

    Who do you think this little boy, clutching a plant, could be?

  • It's Charles Darwin!

    (1809 – 1882) This English naturalist proposed a theory of evolution based on natural selection after studying species aboard the HMS Beagle.

  • Who's this future chemist?

    Hint: This sassy lady's findings were quite radioactive.

  • It's Marie Curie!

    (1867-1934) Famous for discovering polonium, uranium, and coming up with a theory of radioactivity, Marie Curie was the first woman to receive the Nobel prize.

  • Who's this legendary American inventor?

    This boy had some very <em>bright</em> ideas...

  • It's Thomas Edison!

    (1847-1931) Prolific inventor and businessman with over 1,093 patents, here Edison holds his most famous invention: the light bulb.

  • Does this boy look like future "father of the hydrogen bomb"?

    His research turned out to be explosive...

  • It's Edward Teller!

    (1908–2003) Early member of the Manhattan Project, this controversial nuclear physicist helped invent one of the first atomic bombs and spearheaded the development of the H-bomb.

  • And does this boy look like "father of the atomic bomb?"

    This boy wound up fighting with the scientist from the previous slide.

  • It's Robert Oppenheimer!

    (1904-1967) J. Robert Oppenheimer puffs on a pipe during an interview at the Institute for Advanced Study in Princeton, N.J., April 5, 1963. Oppenheimer, scientist with the Manhattan Project that developed the first atom bomb, regretted his participation in the program in his later years. (AP)

  • Who is this future chemist, and the father of molecular biology?

    Can't you tell from these amazing PANTS that he became a peace activist, too?

  • It's Linus Pauling!

    (1901-1994) Considered one of the most influential chemists in history, Pauling founded the fields of quantum chemistry and molecular biology. He was awarded the Nobel Prize in Chemistry in 1954 and the Nobel Peace Prize in 1962.

  • Who's this future primatologist?

    This baby loved chimps from the very beginning -- and she's never stopped.

  • It's Jane Goodall!

    (Born 1934) Considered the world's leading expert on chimpanzees, Goodall has studied their behavior ever since 1960. She has become a prominent advocate for conservation and animal welfare issues.

  • Who's this future innovator?

    Would you believe that this prim boy ended up with 350 patents?

  • It's Alfred Nobel!

    (1833-1896) Swedish chemist, engineer and innovator, Nobel invented dynamite. He is most famous for the prizes funded posthumously in his name.

  • Who is this future DNA pioneer?

    It would be easier to make a pun about his discovery if he were wearing <em>jeans</em>.

  • It's James Watson!

    (Born 1928) One half of the Watson and Crick duo (and let's not forget Rosalind Franklin too), this molecular biologist, geneticist and zoologist helped discover the structure of DNA.

  • Who's this future geneticist?

    She was a-<em>maize</em>-d by chromosomes.

  • It's Barbara McClintock!

    (1902-1992) Considered the world's most distinguished cytogeneticist, McClintock studied what happens to chromosomes during the reproduction of maize. She is the only woman to have received an unshared Nobel Prize for Physiology or Medicine.

  • Who's this future math lover?

    Can you guess who this is from her calculating look?

  • It's Ada Lovelace!

    (1815-1852), Born Ada Augusta Byron, she was literary legend Lord Byron's only legitimate child. She was an avid mathematician and wrote what is considered the first computer program -- an algorithm intended to be processed by a machine.

  • Who is this future physicist?

    We'd make a pun if the little boy were holding a cat in this photo...

  • It's Erwin Schrödinger!

    (1887-1961) This Austrian quantum physicist is most famous for his namesake "Schrodinger's cat" formulation, and for his work on wave mechanics.

  • Who is this future neurologist?

    His pensive look here might foreshadow his future obsession with the unconscious...

  • It's Sigmund Freud!

    (1856-1939) This neurologist and founding father of psychoanalysis developed many theories about the unconscious. While many of his ideas were controversial, they are considered to be some of the most influential of the 20th Century.

  • Who's this psychoanalyst (in the middle)?

    A hint: She followed in the footsteps of the last guy...

  • Anna Freud

    (1895-1982) Considered one of the founders of child psychoanalysis, Anna followed in her father's footsteps. Although she never pursued formal scientific training, she did receive an honorary M.D. and Sc.D.

  • Can you guess this future cosmologist?

    This little boy in a sweater vest is still doing important work in physics today.

  • Stephen Hawking

    (Born 1942) Famous for his work on the radiation emitted from black holes -- now called Hawking radiation -- this theoretical astrophysicist set forth a cosmology that unites the theory of general relativity and quantum mechanics.

  • Who's this future mathematician?

    This child prodigy could already divide eight-digit numbers in his head when he was only six years old...

  • It's John von Neumann!

    (1903-1957) An applied mathematician, von Neumann made contributions to many academic fields -- including mathematics, physics, statistics, economics, computer science, and even genetics.

  • Who's this future astronaut?

    That's one small step for a boy...

  • It's Neil Armstrong!

    (1930-2012) As the first man to walk on the moon, this astronaut and aerospace engineer is most famous for uttering the phrase: "That's one small step for [a] man, one giant leap for mankind."