Crossword puzzle clue "research into"

Oinker originally developed for medical research and now used for how adorable an animal can be research

Whence the line "Into the eternal darkness; into fire and into ice"

Research, ... into

"7. I was so into video games as a kid (I drove at least two ___ into the ground), I was convinced I was going to make them as an adult."

Goer into the wild Hirsch in "Into the Wild"

Roll a dollar bill into a nose straw and suck some of that good good into your honker

Parts of research papers

Subject of some 1960s CIA research