I wondered if today were some kind of anniversary, but no, WATSON and CRICK's article was published in April. Also, while looking for that date, I learned that they did not discover DNA, but rather discovered its DOUBLE HELIX structure. Nice, by the way, that those first four bold words are found symmetrically in the puzzle. The swirl of "DNA" down the center is also lovely.
The structure of the puzzle, however, strains a bit. ACNED (29D: Spotted at the prom, perhaps?), despite its cute clue, is pretty ugly, and ERO, ENDO, BANOS (36A: Spanish baths), ACOP, and MDLI are all less than great.
On the other hand, ARACHNID (20A: Scorpion, for one) is strong, BRINDISI (36D: Port city at one terminus of the Appian Way) is great trivia, and STUBBY is fun, as are the clues for WED (41D: Enter an altared state?) and ROIS (16A: 18 Louises). That last one was news to me. I thought they would have stopped with the "Louis" name after #16 got his head cut off.
Some entries, like REALGNP, AGREESTO, TENACE, and DECEASE seem a little bland, but one can't really complain too much about that, can one? At least I'm not going to, because I'm hoping that Mr. Collins will buy me a couple PILSNERS in Stamford if he comes east again for the ACPT this year. Is that wrong?