puzzle

 ACROSS

  1 Org. working with SpaceX

  5 Home for a baseball player?

 10 "100 years... 100 Movies" list org.

 13 Five Norwegian kings

 15 Vows

 16 Person who gets into good habits?

 17 Being who may take teeth

 18 Flatter, but not blander

 20 Moderately slow, in music

 22 Peaceful pastoral poem

 23 Mixer, but not blender

 26 Funerary heap

 28 Get the ___ (be chosen)

 29 Rae of "Insecure"

 30 Open the door for

 31 The "S" of UCSF

 33 Start of a logician's conclusion

 35 SSNs and such

 36 Obstructor of views, but not blinder

 40 Fluffy accessory

 41 A piano has 88 of them

 42 Warmhearted attention, briefly

 43 Hits over the head

 45 Pile of clutter

 47 Paranormal "power," for short

 50 Razor's cutting feature

 51 Lighter-headed, but not blonder

 54 Sheets and tablecloths

 56 Home of Georgia Tech

 57 Slip, but not blunder

 60 World-weariness

 61 Payback note?

 62 Scope

 63 Common flashlight battery

 64 ___-out (poor excuse)

 65 Largest fencing weapons

 66 Historic stretches

DOWN

  1 Jack Sprat's dietary restriction

  2 Family support group related to AA

  3 Sent regrets

  4 "I wish it weren't the case"

  5 Impersonate

  6 Physicist's principle

  7 Had a bite

  8 Belonging to others

  9 Founded, on a sign: Abbr.

 10 Skilled in reasoning

 11 All-inclusive scholarship

 12 Tats

 14 Match up

 19 Use the hunt-and-peck method, say

 21 Pang of guilt

 24 African flies (SESTETS anagram)

 25 "Wynonna ___" (TV series)

 27 USNA grad's rank

 30 Kick back

 32 Arctic diving birds

 34 Prepared

 36 "Ta-ta!"

 37 Quit something for good, informally

 38 Church song

 39 Rink performance that includes twizzles

 40 Letters after some dates

 44 Superman's earthly last name

 46 Ohio and Iowa

 48 Unsaintly one

 49 Clark who sang "Downtown"

 51 Dis-cover?

 52 Baldwin of "30 Rock"

 53 Train track parts

 55 Ireland, to locals

 57 Insta upload

 58 Odd number that's not prime

 59 "A very high price to pay for maturity," per Stoppard

solution