Time again for another week’s roundup of Twitter #weirdscifacts!  This week we reached the dubious milestone of fact #666!  To celebrate, we provide a bonus fact, and two of the facts this week are my own posts on WEIIIIIIRD OPTIIIIIIICS!!!

662. Jan 04: Jeanne Baret, an 18th century lady botanist who disguised herself as a man to travel!  (h/t @jenlucpiquant)

663. Jan 05: A camera fast enough to watch light move?  The link leads to my own post on the “picosecond camera”, which can record images — with some caveats — as such a rate as to track the motion of a pulse of light!

664. Jan 06: What happens when your brain is split in two — and you survive? With the connection between the left/right halves severed, many bizarre “split personality” behaviors have been observed. (h/t @jenlucpiquant)

665. Jan 07: So, what is a “temporal cloak“, anyway? Another of my posts, on the recent announcement of a cloak that can hide an event in time!  Again, not quite as shocking as it initially sounds, but quite remarkable research.

666. Jan 08: Sharks contain urea (normally a component of urine) in their body tissue.  Many species of fish are constantly losing water to the salt-rich seawater surrounding them, and much replenish it.  Sharks, however, use urea to help keep the ion balance in their body comparable to that of the sea.  (h/t @whysharksmatter)

667. Jan 09: The pearl fish makes its home in the anus of sea cucumbers.  (h/t @edyong209)

667a. Bonus fact!  On December 6th, 1916, a German military vessel sunk a set of dinosaurs. (h/t @Laelaps)

668. Jan 10: The scientific lecture that included full-frontal male nudity!  Even worse, the lecturer waggled his exposed erect penis as he waded into the audience… for science! (h/t @miriamgoldste)