Today I depart from my normal schedule and the current story line and science line. A giant has left us and I want to pay proper tribute.

Dr Stephen Hawking enjoyed telling people of his fortunate birth date, exactly 300 years after Galileo Galilei passed away. He liked a good joke, and I think he’d be tickled with this additional connection to the man whose work made Hawking’s work possible:

The equation in the center of this cut is Hawking’s favorite result, which he wanted to be carved on his gravestone. It links a black hole’s entropy (**S**) to its surface area (**A**). The other letters denote a collection of constants that have been central to the development of theoretical Physics over the past century and a half:

is Boltzmann’s constant, which links temperature with kinetic energy**k**is the speed of light, the invariance of which led Einstein to Relativity**c**is Newton’s universal gravitational constant**G**is Planck’s constant, the “quantum of action”**h**

Hawking spent much of his career thinking deeply about the implications of Einstein’s concepts. Newton’s equations support excellent descriptions of everyday physical motions, from the fall of raindrops to the orbits of solar systems. Einstein’s equations led to insights about conditions at the most extreme — velocities near lightspeed, masses millions of times the Sun’s but packed into a volume only a few dozen miles wide.

But Hawking also pondered extremes of the ultimately large and the ultimately small — the edge of the Universe and distances far smaller than atomic nuclei. Because his physical condition prohibited speech or quick jottings, he was forced to develop extraordinary powers of concentration and visualization that enabled him to encapsulate in a few phrases insights that would take others books to develop and communicate.

Hawking wrote books, too, of course, of a quality and clarity that turned his name and Science into watchwords for the general public as well as the physics community. By his life and how he lived it he was an inspiration to many, abled and otherwise. Science needs its popularizers, though some in the field deprecate them as hangers-on. Hawking managed to bridge that gap with ease and grace, a giant with standing on either side.

*Requiescat in pace*, Dr Hawking. Thank you.

~~ Rich Olcott