Ella Fitzgerald's 96th Birthday

Ella Fitzgerald was an American jazz vocalist with an incredible vocal range. She was noted for her purity of tone, impeccable diction, phrasing and intonation, and a "horn-like" improvisational ability, particularly in her scat singing (as according to Wikipedia).

Earth Day 2013

Earth Day 2013's doodle features an interactive app that takes you through the seasons of nature...which in my opinion is far more interesting than the static floral one shown on Earth Day 2012.

Leonhard Euler's 306th Birthday

Leonhard Euler, born on the 15th April 1707, was a Swiss mathematician and physicist who made many important discoveries which were vital in the fields of mathematics and physics. His notable works include the introduction of modern mathematical terminology and notation, as well as his contributions in mechanics, fluid dynamics, optics and astronomy.

Maria Sibylla Merian's 366th Birthday

Today's Google doodle features detailed illustrations of some insects, caterpillars, butterflies and oddly enough, an iguana or some lizard-like entity as well.

It is apparently created to celebrate the 366th birthday of a German naturalist and scientific illustrator, Maria Sibylla Merian. She was known for her detailed observations and documentation of butterfly metamorphosis.