A Google doodle honors Robert Bunsen.

At long last, Google's "doodles" are making their way to the Google Search for iPhone app. The topical, witty, and often whimsical takes on Google's logo appear globally and in selected countries to honor holidays and other historically important dates.

There isn't much official news from Google yet. CNET requested more information from Google after we noticed an update to the iTunes app store and updated the app on an iPhone 4.

In the meantime, you can peruse Google's doodles in reverse chronological order here.