When you are on a train and it's raining out, you see different sizes of raindrops moving on the outer side of the window.
Which raindrops move faster, bigger or smaller ones?
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
No explanations have been posted yet. Check back later!