puzzle

 ACROSS

  1 Where to find shells?

  9 Grace and Frankie or Thelma and Louise?

 13 "There is someone who could help ..."

 15 Yours, in the Bible

 16 "Can I go now?"

 17 French ___ (mellow instruments)

 18 Neither's partner

 19 Interweave

 21 Obtain

 22 Like some beer at a bar

 25 Email provider since 1997

 26 http://womeninstem.org, for instance

 27 Microwave, informally

 29 Apple CEO Cook

 30 Fork prong

 31 Told lies, or prepared to catch flies

 34 Figures of interest?

 35 Scare suddenly

 36 Electric vehicles, e.g.

 38 Isn't worthy in comparison

 39 "Say nothing about this!"

 41 13 and 24, for this puzzle's constructor and editor

 42 Off-road ride: Abbr.

 43 "Pow!"

 44 ___ Speedwagon

 45 Stair part

 47 ___ congestion

 51 Come to a close

 52 Loved dearly

 54 Spy org.

 55 "Spider-Man" director Sam

 57 Athlete who's aptly lightning-fast

 60 "To clarify ..."

 61 Where "Who are you wearing?" is asked

 62 Test version

 63 In a like-minded way

DOWN

  1 Grand instrument

  2 Ohio rubber hub

  3 Hagar the Horrible's dog

  4 Haul to a garage, say

  5 Amazement

  6 Wished, as a farewell

  7 Intense pain

  8 Fall behind schedule

  9 Vietnamese noodle soup

 10 Imaginary instrument

 11 Hidden intellectual side

 12 Fidgety

 14 "Oh, su-u-ure!"

 15 Nickname related to Teddy

 20 Dot follower, often

 23 Shades in skyscapes

 24 Jeans, e.g.

 28 Buddy

 30 Third-largest city in Washington

 31 Hollywood pseudonym

 32 Meal plan that's both ancient and modern

 33 Spoiled, as milk

 34 "Girl Meets World" star Blanchard

 35 Part of a rack at a barbecue joint

 37 Taxi

 40 Supervise

 42 "First" or "financial" follower

 45 Reason for an indoor recess

 46 "___, set, go!"

 48 Extent

 49 Choreographer Alvin

 50 Starbucks order that may be iced

 53 Chop into cubes

 56 Apt sound from a mother goat?

 58 ___ King Cole

 59 Certain sib

solution