Well, many readers got these, but some used a reverse image search, which is HEINOUS. Hey guys, don’t do that!
Anyway, here are the answers above each photo:
Cat flea (Ctenocephalides felis):
T4 phage (virus). As many readers pointed out, this is either a model or a manipulation of some kind. I should have known that, as it simply looks too good (though that’s not always dispositive evidence). At any rate, it’s being touted all over the Internet as a real virus picture. But at least you know what the famous T4 phage (a subject of much genetic experimentation) looks like:
A snowflake, for crying out loud!
And the human tongue; I assume the protuberances are taste buds:
Now, what is this?