puzzle

 ACROSS

  1 Underwater habitat

  5 La Tomatina's country

 10 Word after "nanny" or "panda"

 13 Simple racetrack's shape

 14 Big name in insurance

 15 Bull's gender

 16 First, in Psychology, Joe Six-Pack learned that students who do best ___

 18 De-wrinkle

 19 Former quarterback Manning

 20 Angled accessibility aid

 21 Recorded

 22 A step up ... or down

 24 They say it doesn't pay

 26 Then, in Civil Engineering, Joe and his workout buddies teamed up to ___

 31 Apple's word processor

 34 Bert's roommate

 35 Not feeling well

 36 Trois + cinq

 37 The Big Apple, for short

 38 Close tightly

 39 Blunder

 40 Magazine edition

 42 Letter before delta

 43 Later, in Naval History, Joe heard about traitorous sailors who had to ___

 46 "___ Anatomy"

 47 Soaks up warmth

 50 "Get outta here!"

 52 They're steeped

 54 Graceless person

 56 Pound sound

 57 Finally, in Statistics, Joe was taught several ways to ___

 60 Lie adjacent to

 61 One celebrating Diwali

 62 Landed

 63 Sugar measure: Abbr.

 64 Poker player's "Check"

 65 Cause of great annoyance

DOWN

  1 Stood up

  2 Lesser of two ___

  3 Weird Al hit whose title is sung after "just"

  4 Seasonal ailment

  5 iPhone browser

  6 Popular 'do in an '80s yearbook

  7 Sitting on

  8 Place to stay

  9 One running in D.C.?

 10 The original YOLO?

 11 Succulent described as a "wonder plant"

 12 Darn, like a sock

 15 Dolphins' city

 17 Toyota hybrid

 21 Get sleepy

 23 Aid's partner

 24 Take off the air

 25 Ballplayer's stat

 27 Contact case contents

 28 Run out of water

 29 Glitz's partner

 30 Fitzgerald known for scat

 31 "What a relief"

 32 Spiritual glow

 33 Band such as BLACKPINK or Bananarama

 38 Fifth Avenue store

 40 Hot couple

 41 Bashful

 42 Grind, as teeth

 44 Cheez Whiz company

 45 What you can count on

 48 Australian animal that isn't a bear

 49 Glossy fabric

 50 Try to hit

 51 Corn holders

 52 Fish in a joke about a piano

 53 Finishes

 55 Destiny

 57 Chinese life force

 58 Tear

 59 Bit of cream

solution