January 4th is the birthday of Sir Isaac Newton, the English physicist and astronomer who discovered the law of gravity in plain science. Google is celebrating his birthday with a cool logo animation.
Once you open Google Search at www.google.com or www.google.com.ph, the search page will show the Google logo with a branch of an apple tree bearing fruits. After a second or two, one apple falls on the ground. This animation represents Newton's law of gravity.
Aside from being a physicist and astronomer during his time, Newton was also a mathematician, natural philosopher, alchemist, and theologian who is perceived and considered by a substantial number of scholars and the general public as one of the most influential scientists in history - more from Wikipedia
I think the "falling apple" at Google - Newton's Google doodle - is the first animated Google logo doodle ever..