Is it just me or is the phrase "human beings" used more often than simply "humans"? I've just started to notice this: the next word after "human" is very often "beings". Whenever someone wants to emphasize our humanity (as opposed, say, to a horse's horseness), they almost always say "human _beings_" instead of "humans". Somehow "human beings" seems to emphasize the "human spirit/soul".

Yes. There are lots around; whenever the original word becomes too short for the importance people want to give it.

Tuna fish, chai tea, Enter the room -> enter “into” the room, French: hui (today) -> aujourd’hui (day of today)

Keyword: pleonasm