Today is one of the saddest days in our lives. Stephen Hawking; the rare genius passed away today morning at the age of 76. In what may be regarded as an astounding coincidence; today is also Pi Day. This day is each year when scientists and mathematicians celebrate the ratio of a circle's circumference to its diameter. March 14 also marks as the birthday of great Scientist Albert Einstein who would have turned 139 this year.

While remembering Stephen; here’s all about him that the world knew or dint know.
Born on January 8, 1942 Stephen Hawking was a British scientist, professor and author who has done ground breaking work in physics and cosmology, and whose books helped to make science accessible to everyone. At age 21, while studying cosmology at the University of Cambridge, he was diagnosed with amyotrophic lateral sclerosis (ALS). Part of his life story has also been depicted in the 2014 film The Theory of Everything.

Some of the must-read books by this brightest star of Science are:

1. A Brief History of Time
In 1988 Hawking catapulted to international prominence with the publication of A Brief History of Time. The short, informative book became an account of cosmology for the masses and offered an overview of space and time, the existence of God and the future. The work was an instant success, spending more than four years atop the London Sunday Times' best-seller list. Since its publication, it has sold millions of copies worldwide and been translated into more than 40 languages.

2. The Universe in a Nutshell

A Brief History of Time also wasn't as easy to understand as some had hoped. So; in 2001, Hawking followed up his book with The Universe in a Nutshell, which offered a more illustrated guide to cosmology's big theories.

3. A Briefer History of Time

In 2005, Hawking authored the even more accessible A Briefer History of Time, which further simplified the original work's core concepts and touched upon the newest developments in the field like string theory.

Together the above three books, along with Hawking's own research and papers, articulate the physicist's personal search for science's Holy Grail: a single unifying theory that can combine cosmology with quantum mechanics to explain how the universe began. It's this kind of ambitious thinking that has allowed Hawking, who claims he can think in 11 dimensions, to lay out some big possibilities for humankind. He's convinced that time travel is possible, and that humans may indeed colonize other planets in the future.

4. The Grand Design

In September 2010, Hawking spoke against the idea that God could have created the universe in his book The Grand Design. Hawking previously argued that belief in a creator could be compatible with modern scientific theories. His new work, however, concluded that the Big Bang was the inevitable consequence of the laws of physics and nothing more. "Because there is a law such as gravity, the universe can and will create itself from nothing," Hawking said. "Spontaneous creation is the reason there is something rather than nothing, why the universe exists, why we exist."

In addition to the above, Stephen has blessed the world with various unique and interesting facts and theories of the universe. Sad but true, Stephen will be missed by science each day.

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